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HomeCertificationsPCNEDomainsImplementing hybrid interconnectivity
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Implementing hybrid interconnectivity

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All PCNE Implementing hybrid interconnectivity questions (144)

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1

A company is deploying a Dedicated Interconnect with a 10 Gbps circuit to Google Cloud. They need to ensure high availability. Which configuration is required by Google Cloud to meet the high availability SLA?

2

A company has a Hybrid Connectivity setup using Cloud VPN with dynamic routing (BGP). They notice that traffic from their on-premises network to Google Cloud is intermittently dropping. The on-premises BGP speaker is sending routes with a higher local preference (200) than the Google Cloud router (default 100). What is the most likely cause of the intermittent drops?

3

A multinational corporation is connecting five on-premises data centers to Google Cloud using Cloud Interconnect. Each data center has a dedicated 10 Gbps connection. They want to ensure that if one Interconnect fails, traffic is automatically redistributed across the remaining connections without manual intervention. Which solution meets this requirement?

4

An organization wants to migrate legacy on-premises applications to Google Cloud but must maintain low-latency connectivity for real-time data synchronization. The on-premises data center is in a colocation facility that is not directly served by Google Cloud. Which hybrid connectivity option is most cost-effective while meeting the latency requirement?

5

A company is using Cloud VPN with BGP to connect their on-premises network to Google Cloud. They have two VPN tunnels from two different on-premises VPN gateways to a single Cloud VPN gateway. They notice that during maintenance on one on-premises gateway, traffic fails over to the other tunnel, but after the maintenance, traffic does not fail back. What is the most likely cause?

6

A financial services company is required to encrypt all data in transit between their on-premises data center and Google Cloud. They have a Dedicated Interconnect connection. They want to meet the encryption requirement while minimizing overhead and complexity. Which solution should they implement?

7

A company wants to connect their VPC to an on-premises network using Cloud VPN. They need to ensure that traffic from Google Cloud to on-premises uses a specific route only when the primary path is available, and otherwise fails over to a backup path. Which configuration should they use?

8

An enterprise is using a 10 Gbps Dedicated Interconnect between their on-premises data center and Google Cloud. They measure throughput and find it is only 5 Gbps even though there is no congestion. The on-premises router is configured with a single VLAN attachment. What is the most likely cause?

9

A company is planning to connect multiple VPCs in different regions to their on-premises network using a single Dedicated Interconnect. Which TWO configurations are required to achieve this?

10

A company has a Hybrid Connectivity setup using Cloud VPN with BGP. They want to migrate to Dedicated Interconnect for better performance. During the migration, they need to avoid downtime. Which THREE steps should they take?

11

A company is troubleshooting connectivity issues between their on-premises network and Google Cloud over a Dedicated Interconnect. They can ping the VLAN attachment IP but cannot reach Compute Engine instances. Which TWO checks should they perform?

12

A company is using Cloud Interconnect with multiple VLAN attachments. They want to implement traffic shaping to prioritize real-time traffic over bulk transfers. Which THREE actions should they take?

13

Refer to the exhibit. The Cloud Router shows one BGP peer as ESTABLISHED and one as IDLE. The best routes show two routes to the same destination with different priorities. What is the most likely reason the IDLE peer is not establishing?

14

A large e-commerce company has a hybrid cloud setup with a Dedicated Interconnect between their on-premises data center in Dallas and Google Cloud us-central1 region. They have a single VLAN attachment with a Cloud Router that uses BGP to exchange routes. The on-premises network uses 10.0.0.0/8, and Google Cloud VPC uses 172.16.0.0/16. They recently deployed a new application in us-west1 that uses IP range 172.17.0.0/16. They created a VPC peering between the us-central1 VPC and the us-west1 VPC. On-premises users can reach the us-central1 workloads but cannot reach the us-west1 application. There are no firewall rules blocking traffic. The on-premises router has a default route pointing to the Interconnect. What is the most likely cause of the issue?

15

A company needs to connect their on-premises data center to Google Cloud using Dedicated Interconnect. They have a service level agreement that requires 99.99% availability for the connection. What is the minimum number of VLAN attachments they must provision, and how should they be configured to meet this SLA?

16

An organization is using Cloud VPN with dynamic routing (BGP) to connect their on-premises network to Google Cloud. They notice that traffic from Google Cloud to on-premises is not using the VPN tunnel but instead going through the internet. They have verified that the VPN tunnel is up and BGP sessions are established. Which configuration issue is most likely causing this behavior?

17

A company wants to migrate a legacy application to Google Cloud that requires low-latency communication with on-premises databases. The application is latency-sensitive and must use private IP addresses only. Which hybrid connectivity solution should they choose?

18

An organization has multiple VPCs in Google Cloud that need to communicate with an on-premises network through a single Dedicated Interconnect. All VPCs are in the same project. What is the most efficient way to enable connectivity from all VPCs to on-premises?

19

A network engineer is troubleshooting a Cloud VPN tunnel that is not passing traffic. The tunnel status shows as established, and BGP sessions are up. However, traffic from an on-premises subnet (10.0.1.0/24) to a GCP subnet (192.168.1.0/24) is not working. What should the engineer check first?

20

A network engineer is troubleshooting connectivity between an on-premises network and Google Cloud. The on-premises router has two BGP sessions configured for redundancy with a Cloud Router. The engineer runs the command above. Which issue does the output indicate?

21

A network engineer is setting up Dedicated Interconnect and sees the output above. What does the 'encryption: IPSEC' field indicate about this VLAN attachment?

22

A company is designing a hybrid network with Partner Interconnect. They need to ensure high availability and meet a 99.99% SLA. Which TWO actions should they take?

23

An organization is using Cloud VPN with dynamic routing and wants to improve failover time between two VPN tunnels. Which THREE configuration changes can help reduce failover time?

24

A company is setting up a Dedicated Interconnect connection between their on-premises network and Google Cloud. They have configured a VLAN attachment and assigned a Cloud Router with BGP sessions. They notice that traffic is being dropped intermittently. The BGP session status shows 'Established' but routes are not being exchanged consistently. What is the most likely cause?

25

A company wants to connect their on-premises network to Google Cloud using a VPN with high availability and 99.99% SLA. They have two Cloud VPN gateways, each with two external IP addresses. Which configuration best meets the high availability requirement?

26

A network engineer configured a Cloud Router with the BGP configuration shown. The on-premises router (AS 64512) is peering with the Cloud Router (AS 65001) over a Dedicated Interconnect VLAN attachment. The engineer notices that traffic from on-premises to Google Cloud is not being routed via this interconnect as expected. What is the most likely cause?

27

A company is planning to migrate workloads to Google Cloud and needs to establish hybrid connectivity with high bandwidth (10 Gbps) and low latency. They also require the ability to scale bandwidth up to 80 Gbps in the future. Which TWO options should they consider?

28

A large enterprise has a multi-site on-premises network with two data centers (DC1 and DC2) connected via a private WAN. They are migrating critical applications to Google Cloud and have established a Dedicated Interconnect at each data center, each with a single VLAN attachment (vlan-attachment-1 from DC1, vlan-attachment-2 from DC2) connected to a single VPC network in us-central1. Each VLAN attachment uses a separate Cloud Router (router-us-central1-dc1 and router-us-central1-dc2) with BGP sessions advertising the same on-premises prefixes. The VPC has auto-mode subnet ranges. They notice that traffic from Google Cloud to on-premises is flowing only through DC1, and when DC1's interconnect fails, traffic fails over to DC2, but after DC1 recovers, traffic does not return to DC1. The on-premises routers are advertising the same prefixes with equal MED values. What is the most likely cause and the best corrective action?

29

A company has a Dedicated Interconnect connection between their on-premises data center and Google Cloud. They are experiencing intermittent connectivity issues on a specific VLAN attachment. The VLAN attachment is configured with a single Cloud Router and BGP sessions are established. Which two steps should they take to troubleshoot the issue? (Choose two.)

30

A company is deploying a hybrid cloud solution using Partner Interconnect. They have ordered a 1 Gbps connection from a partner at a colocation facility. The on-premises network uses a 10 Gbps link to the colo, and the partner provides a single 1 Gbps connection to Google Cloud. The company wants to connect two separate VPC networks in Google Cloud (production and development) to their on-premises network. Each VPC requires 500 Mbps of dedicated bandwidth. The company also needs high availability for the connection. What should they do?

31

Drag and drop the steps to configure Cloud Router with BGP for on-premises connectivity into the correct order.

32

Drag and drop the steps to troubleshoot a VPN tunnel that is not passing traffic into the correct order.

33

Drag and drop the steps to configure a global external HTTP(S) load balancer in Google Cloud into the correct order.

34

Match each VPC firewall rule component to its description.

35

Match each VPC networking concept to its definition.

36

Match each Google Cloud Armor feature to its description.

37

A company needs to connect their on-premises data center to Google Cloud with a consistent, high-availability connection that offers 99.99% availability SLA. The on-premises router supports VLAN tagging and BGP. They expect to burst up to 50 Gbps peak traffic. Which interconnect solution should they choose?

38

A network engineer has configured a Dedicated Interconnect with a VLAN attachment and Cloud Router. BGP sessions are up and routes are exchanged. However, traffic from a specific on-premises subnet is not reaching a VPC instance. The route table shows a custom static route with priority 1000 for that subnet pointing to a VPN tunnel, and a BGP learned route with priority 100 for the same subnet via Interconnect. What is the most likely reason for the traffic not using the Interconnect route?

39

You are designing a hybrid network using Cloud VPN with dynamic routing (BGP) to connect multiple on-premises sites to Google Cloud. What is a best practice to avoid asymmetric routing when you have multiple VPN tunnels from different on-premises routers?

40

An organization needs low-latency connectivity between their on-premises data center and Google Cloud, supporting up to 20 Gbps throughput. They already have a Partner Interconnect connection but need to increase capacity. Which two actions should they take? (Choose two.)

41

Your company has a Dedicated Interconnect between on-premises and Google Cloud. After a maintenance window, some routes are missing from the on-premises side. On the Cloud Router, you see that the BGP session status is 'ESTABLISHED'. However, the route table on the on-premises router does not contain any of the VPC subnets. What is the most likely cause?

42

You are troubleshooting an HA VPN connection between Google Cloud and on-premises. The tunnels appear as 'UP' but no routes are exchanged. The Cloud Router logs show 'BGP session state: IDLE'. What is the most likely cause?

43

A company uses a shared VPC with multiple service projects. They want to connect their on-premises data center to the shared VPC through a Dedicated Interconnect. Where should they configure the Cloud Router and VLAN attachment?

44

You have set up a Dedicated Interconnect with two VLAN attachments (each 10 Gbps) and configured ECMP on the Cloud Router. You observe that traffic from on-premises to a specific VM is only using one attachment. What is the most likely cause?

45

An organization requires a hybrid connectivity option that offers an SLA of 99.99% availability and supports bandwidth up to 100 Gbps. They are willing to manage their own physical infrastructure in a Google colocation facility. Which connectivity solution should they choose?

46

Which TWO of the following are required steps to set up a Dedicated Interconnect?

47

Which THREE of the following could cause a Dedicated Interconnect BGP session to go to the 'IDLE' state?

48

Which TWO situations are most appropriate for using Partner Interconnect instead of Dedicated Interconnect?

49

A company has a Dedicated Interconnect with one 10 Gbps connection. They need high availability for critical workloads. Which design is the best practice according to Google Cloud recommendations?

50

A network engineer is configuring a Cloud VPN tunnel with route-based VPN and BGP. The tunnel is established, but the Cloud Router does not learn any routes from the on-premises peer. What is the most likely cause?

51

A company with multiple VPCs in a Shared VPC environment wants to connect their on-premises network to all VPCs with high availability and minimal cost. They already have a Dedicated Interconnect. What is the most efficient solution?

52

An on-premises router uses BGP ASN 64512. The Cloud Router is also configured with ASN 64512. When the BGP peering is established, what behavior is expected?

53

Which Google Cloud hybrid connectivity option can be configured without using BGP?

54

A company is using Partner Interconnect to connect to Google Cloud. They notice that traffic from on-premises to GCP takes one path, but return traffic takes a different path, causing asymmetric routing. How can they resolve this?

55

A Dedicated Interconnect VLAN attachment is in ACTIVE state. The Cloud Router has learned routes from on-premises, and the on-premises router has learned routes from GCP. However, traffic from on-premises to a GCP VM fails. What should the engineer check first?

56

What is the maximum number of VLAN attachments that can be configured on a single 10 Gbps Dedicated Interconnect connection?

57

A customer is configuring a route-based IPsec VPN tunnel to Google Cloud. On their on-premises router, they must specify traffic selectors (proxy IDs). What should they set the local and remote traffic selectors to?

58

Which TWO configurations provide high availability for Dedicated Interconnect? (Choose two.)

59

Which THREE factors can affect the throughput of a Cloud VPN tunnel? (Choose three.)

60

Which TWO statements about Cloud Router BGP are correct? (Choose two.)

61

A company wants to connect an on-premises network to Google Cloud using Cloud VPN. The on-premises network has a single subnet and no dynamic routing capabilities. The company needs a simple, low-cost solution. Which VPN configuration should they choose?

62

An engineer is configuring Dedicated Interconnect between an on-premises data center and Google Cloud. Cloud Router is set up with BGP sessions. The BGP session remains in Idle state. Which of the following is the most likely cause?

63

A company has two Dedicated Interconnect connections to two separate Google Cloud regions for redundancy. They use Cloud Router with BGP to exchange routes. They want to ensure that traffic from on-premises to a specific VPC in us-central1 uses only the interconnect to us-central1, and the other interconnect is used only as a backup. How can they achieve this?

64

An organization wants to connect their on-premises network to Google Cloud using Partner Interconnect. Which of the following is a requirement that must be met before the partner can provision the connection?

65

An enterprise uses HA VPN to connect their on-premises network to Google Cloud. The on-premises side has a single VPN device that supports BGP. They want to maximize availability. What is the recommended Google Cloud configuration?

66

Company A and Company B both have networks in Google Cloud. They want to connect their VPCs using VPC peering, but they have overlapping IP addresses. How can they resolve this?

67

A network engineer is configuring Cloud Router for Dedicated Interconnect. The on-premises router is advertising a route to 10.1.0.0/16. The engineer wants to ensure that Google Cloud always prefers this route over other routes learned from different on-premises routers. Which BGP attribute should be set on the on-premises router?

68

An engineer has configured an HA VPN tunnel between an on-premises network and Google Cloud. The tunnel status shows as established, but traffic is not flowing. The engineer checks the Cloud Router BGP session and sees it is in the Active state. What is the most likely cause?

69

A company has two HA VPN tunnels from on-premises to Google Cloud using two separate Cloud Routers for redundancy. The on-premises network uses BGP and advertises a default route to Google Cloud. The company wants to ensure that traffic from Google Cloud to on-premises prefers the primary Cloud Router over the secondary. Which configuration should be applied?

70

Which two of the following are prerequisites for configuring an HA VPN tunnel to an on-premises network? (Choose two.)

71

Which three of the following are best practices for designing a highly available Dedicated Interconnect connection to Google Cloud? (Choose three.)

72

An enterprise is evaluating connectivity options to Google Cloud. They have moderate bandwidth requirements (up to 1 Gbps) and need high availability. Which two of the following are appropriate solutions? (Choose two.)

73

Refer to the exhibit. The Cloud Router is connected to two on-premises routers via dedicated interconnect. The on-premises routers advertise the same prefix 10.1.0.0/16. Which on-premises router's route will be preferred by Google Cloud for traffic destined to 10.1.0.0/24? (Assume equal AS path length and MED from on-premises.)

74

Refer to the exhibit. An engineer has configured HA VPN with two tunnels (tunnel-a and tunnel-b) to an on-premises network. The BGP session for peer-b is in IDLE state. What is the most likely cause?

75

Refer to the exhibit. A network engineer configured a Cloud Router to advertise the on-premises subnet 10.0.0.0/8 to the VPC. However, traffic from VPC instances to 10.0.0.0/8 is being dropped. What is the most likely issue?

76

A company is deploying a Global Cloud VPN with multiple tunnels from different Cloud Router instances to the same on-premises peer. The on-premises BGP speaker is configured with multiple peers. How should they configure the BGP ASN on the Cloud Routers to ensure optimal routing?

77

Refer to the exhibit. A Cloud VPN tunnel is configured between an on-premises router and Google Cloud. The BGP session is not established. The on-premises router shows 'Connection refused'. What is the most likely cause?

78

A company wants to connect their on-premises data center to Google Cloud using Dedicated Interconnect. They have ordered a 10 Gbps connection and plan to use a single VLAN attachment. How many Cloud Router interfaces are required for a single VLAN attachment with active/active BGP?

79

A network engineer is troubleshooting an HA VPN setup between Google Cloud and an on-premises data center. The two tunnels are established, and BGP sessions are up on both tunnels. However, traffic from Google Cloud to the on-premises network is only using one tunnel, even though both BGP sessions are advertising the same routes. What is the most likely cause?

80

A company is using Partner Interconnect to connect their data center to Google Cloud. They notice that traffic from their on-premises network to a specific subnet in VPC is taking a suboptimal path. Which action should they take to influence the routing preference?

81

A customer wants to use Cloud VPN to connect a small branch office to Google Cloud. The branch office has a dynamic public IP address. Which Cloud VPN type should they use?

82

An organization has multiple VPCs in different regions that need to connect to a single on-premises data center via Dedicated Interconnect. They want to minimize cost and complexity. What is the recommended architecture?

83

Refer to the exhibit. A Cloud VPN tunnel is configured with the above Cloud Router configuration. The on-premises BGP peer is at 169.254.0.2 with ASN 65001. The on-premises router is receiving the route 10.0.0.0/8 from the Cloud Router, but it is not receiving any of the specific subnets (e.g., 10.1.0.0/16) that exist in the VPC. What is the most likely cause?

84

A company has deployed Dedicated Interconnect with a 10 Gbps connection. They are experiencing packet loss when transferring large files. The on-premises MTU is set to 1500. What is the maximum MTU that can be set on the Cloud Router interface to avoid fragmentation?

85

Which TWO are valid methods to allow on-premises traffic to reach Google Cloud resources that only have internal (private) IP addresses? (Choose two.)

86

Which THREE are true regarding Cloud HA VPN when used with dynamic routing (BGP)? (Choose three.)

87

Which TWO are necessary components for setting up Dedicated Interconnect? (Choose two.)

88

Refer to the exhibit. A BGP session between a Cloud Router and an on-premises router is not establishing. The Cloud Router logs show 'BGP_OPEN_MSG_ERROR: unsupported capability'. What is the most likely issue?

89

Refer to the exhibit. An engineer is troubleshooting a dual-tunnel HA VPN. The BGP session on one interface is established (State/PfxRcd 1) but the other is stuck in Active state. What can cause this?

90

A company wants to use a third-party VPN appliance on Google Cloud (Compute Engine) to connect to an on-premises network. Which networking feature must be enabled to allow the VPN appliance to forward traffic between VPC subnets and the tunnel?

91

A company needs private connectivity between its on-premises data center and Google Cloud with consistent low latency and high throughput. The on-premises location is close to a Google Cloud point of presence that supports Dedicated Interconnect. The company expects to use more than 10 Gbps of bandwidth in the near future. Which connectivity solution should they choose?

92

A company has set up an HA VPN tunnel between their on-premises router and a Cloud Router in Google Cloud. The on-premises router establishes BGP sessions to both Cloud Router instances, but the routes learned from one Cloud Router instance are not being received. The other instance works fine. What is the most likely cause?

93

A company is designing an HA VPN to connect their on-premises data center to Google Cloud VPC. The on-premises router supports two independent interfaces with public IPs. They want to achieve 99.99% availability for the VPN connection, understanding that HA VPN uses two tunnels and two Cloud Router instances. Which configuration meets this goal?

94

An organization uses Partner Interconnect to connect their on-premises network to Google Cloud. They are experiencing intermittent connectivity issues and suspect the partner service provider is causing the problem. Which Google Cloud tool or feature can help verify the connection status and performance from the Google Cloud side?

95

A company has deployed a Dedicated Interconnect with multiple VLAN attachments connected to a single Cloud Router. They want to influence inbound traffic from on-premises to Google Cloud to use a specific attachment for certain prefixes. Which BGP attribute can they manipulate on the on-premises router to achieve this?

96

A global company has multiple on-premises data centers connected to Google Cloud via separate Dedicated Interconnects. Each on-premises site advertises the same IP prefix for a critical application. They want to ensure that traffic from Google Cloud to that prefix is load-balanced across the two interconnects and also provide automatic failover. Which configuration on Cloud Router meets this requirement?

97

An organization has an on-premises router that only supports static routing and does not support BGP. They need private connectivity to a single Google Cloud VPC. Which solution should they use?

98

A company is using Cloud VPN to connect to Google Cloud. They notice that traffic from their on-premises network to Google Cloud is not being routed correctly after a recent change. On the on-premises router, they verify that the BGP session is established and routes are received. Which step should they take next to troubleshoot?

99

A company has two Dedicated Interconnects in different metro regions connecting to Google Cloud. They want to use BGP communities to influence Cloud Router's route selection to prefer the closer interconnect for outbound traffic to on-premises. Which community action can they apply on the on-premises routers?

100

A company is planning to connect their on-premises network to Google Cloud using Dedicated Interconnect. They require high availability for the connection. Which TWO of the following are recommended by Google for achieving high availability? (Choose two.)

101

A company currently uses Cloud VPN with dynamic routing to connect to Google Cloud. They want to migrate to Dedicated Interconnect without downtime. Which THREE steps should they take to achieve a seamless migration? (Choose three.)

102

An organization is experiencing high latency on their Partner Interconnect connection. Which TWO tools or features can they use to diagnose the issue from within Google Cloud? (Choose two.)

103

An engineer runs the command above to check the status of a Dedicated Interconnect VLAN attachment. The state shows DEFECTIVE. The associated interconnect connection is in ACTIVE state. What is the most likely cause?

104

A network engineer sees the above output from a Cloud Router. There are two BGP peers from the on-premises router (10.0.0.1 and 10.0.0.2). Both learned the same route 10.1.0.0/16 from their respective peers. However, traffic from Google Cloud to 10.1.0.0/16 is only going through the first peer (10.0.0.1) and not load-balanced. What could be the reason?

105

An engineer configured a Cloud Router with the above settings. The VPC network has subnets 10.1.0.0/16 and 10.2.0.0/16, as well as subnets 10.3.0.0/16 and 10.4.0.0/16. The on-premises router is only receiving routes for 10.1.0.0/16 and 10.2.0.0/16 but not for 10.3.0.0/16 and 10.4.0.0/16. What is the cause?

106

A company is setting up HA VPN between on-premises and Google Cloud. They have two Cloud VPN gateways with two tunnels each. They want to ensure automatic failover if one tunnel goes down. Which BGP configuration is a best practice?

107

An organization has established a Dedicated Interconnect to Google Cloud. They can ping instances in a VPC subnet but cannot connect to a service running on a different subnet within the same VPC. What is the most likely cause?

108

A company with limited public IP addresses on-premises needs to connect to Google Cloud using Cloud VPN. They require high availability. Which solution should they implement?

109

When setting up a Partner Interconnect, which Google Cloud resource is used to connect to the partner's network?

110

A customer has established a Dedicated Interconnect, but traffic from on-premises to Google Cloud is still using the internet path instead of the interconnect. What is the most likely cause?

111

An organization uses HA VPN with dynamic routing and active-active BGP sessions. One tunnel fails, but traffic continues to flow through the other tunnel. However, they notice increased latency. What is the most likely explanation?

112

A company needs to connect multiple on-premises sites to Google Cloud using a single Cloud VPN gateway. What is the recommended approach?

113

A customer reports that after setting up HA VPN, some on-premises subnets are not reachable from Google Cloud. The Cloud Router shows the missing routes. What is the most likely cause?

114

An organization has a Dedicated Interconnect with two VLAN attachments connected to two different edge availability domains (EADs). They want to use a single Cloud Router for both attachments. How many BGP sessions should be established on the Cloud Router?

115

Which TWO statements about HA VPN are correct?

116

A Cloud Router BGP session is flapping. Which TWO actions are appropriate troubleshooting steps?

117

Which THREE components are required to set up a Partner Interconnect connection?

118

Your company has a Dedicated Interconnect with two VLAN attachments (vlan-attachment-a and vlan-attachment-b) connected to two different Edge Availability Domains (EADs) in the us-central1 region. Both attachments are associated with a single Cloud Router named 'cr-us-central1'. On-premises, you have two routers (rtr-a and rtr-b) each connected to one VLAN attachment via BGP. The Cloud Router has four BGP sessions: rtr-a (vlan-a), rtr-a (vlan-b), rtr-b (vlan-a), rtr-b (vlan-b) — a full mesh for redundancy. All sessions are established and routes are exchanged. Recently, you added a new on-premises subnet 192.168.100.0/24 and advertised it via BGP from both on-premises routers. However, Google Cloud instances in the VPC cannot reach this subnet. Other on-premises subnets (e.g., 10.0.0.0/8) are reachable. The Cloud Router route table for 'cr-us-central1' shows multiple entries for 192.168.100.0/24, each with different next hops but all with status 'stacked'. There are no BGP route filters configured. What is the most likely cause of the issue?

119

A company wants to connect its on-premises data center to Google Cloud. They have a single VPN appliance on-premises and need high availability for the connection. Which architecture provides the most cost-effective high availability solution?

120

A company is using Dedicated Interconnect to connect their on-premises network to Google Cloud. They have two VLAN attachments configured, each with a separate Cloud Router with active/active BGP. They want to ensure that traffic from their on-premises network to Google Cloud uses both attachments equally. Which configuration should they implement?

121

After configuring Cloud VPN with dynamic routing (BGP), you notice that on-premises routes are not appearing in Google Cloud. BGP sessions are established but no prefixes are exchanged. Cloud Router logs show: 'No route advertisement received'. On-premises BGP configuration shows 'network 10.0.0.0/8' and 'neighbor 10.1.1.1 remote-as 65000'. What is the most likely cause?

122

A company has a Cloud VPN between their on-premises network and Google Cloud. They want to ensure that traffic flows symmetrically, meaning that traffic from Google Cloud to on-premises uses the same VPN tunnel as traffic from on-premises to Google Cloud. Which best practice should they implement?

123

A company requires a dedicated connection from their on-premises data center to Google Cloud with a guaranteed SLA of 99.99% and bandwidth starting at 10 Gbps. Which connectivity option meets these requirements?

124

An organization has a hybrid network with multiple VPN tunnels connecting their on-premises network to Google Cloud. They use Cloud Router with BGP to propagate routes. They recently added a new subnet 192.168.100.0/24 in Google Cloud. On-premises devices can reach resources in the new subnet, but Google Cloud resources cannot initiate traffic to certain on-premises hosts in the 10.0.0.0/8 subnet. BGP sessions are all established. What is the most likely cause?

125

Which TWO of the following are benefits of using Cloud Interconnect over Cloud VPN for hybrid connectivity? (Choose two.)

126

Which THREE of the following are requirements for setting up a Dedicated Interconnect connection to Google Cloud? (Choose three.)

127

A Cloud VPN with dynamic routing (BGP) is established between an on-premises network and Google Cloud. The on-premises BGP router is advertising a default route (0.0.0.0/0). The Cloud Router in Google Cloud is receiving this route, but network traffic from Google Cloud VMs to the internet is not being routed through the VPN. Which THREE troubleshooting steps should you take? (Choose three.)

128

A multinational company is migrating workloads to Google Cloud and requires a hybrid connectivity solution between their on-premises data centers in New York and London and Google Cloud regions us-central1 and europe-west1. Each data center has a pair of redundant border routers. The network team has set up a Dedicated Interconnect connection in each Google Cloud region, with two VLAN attachments per region (total 4 attachments). Each VLAN attachment is associated with a separate Cloud Router. The Cloud Routers in us-central1 are configured with BGP sessions to the on-premises routers in New York, and the Cloud Routers in europe-west1 peer with the London routers. The VPC is in 'global' dynamic routing mode. After deployment, traffic from on-premises London to Google Cloud in us-central1 takes a suboptimal path: it goes from London to us-central1 via the internet instead of using the Dedicated Interconnect in europe-west1 and then internal Google Cloud backbone. All BGP sessions are up, and routes are being exchanged. The on-premises routers are advertising all their subnets. The Cloud Routers are learning the on-premises prefixes. What is the most likely cause of this suboptimal routing?

129

A company has set up a Cloud VPN with dynamic routing (BGP) between their on-premises network (AS 65001) and Google Cloud (AS 64514). They are using Cloud Router with a regional dynamic routing mode. The on-premises router is advertising a subnet 10.1.0.0/16. The Google Cloud VPC has subnet 10.2.0.0/16 in the same region as the Cloud Router. Both subnets are unique. The connection has been working for months. However, after a recent maintenance window, the on-premises router started experiencing BGP flapping with the Cloud Router. The Cloud Router logs show 'BGP notification sent: Hold timer expired'. The on-premises router logs show similar errors. The network team has verified that the VPN tunnel is established and stable. What is the most likely cause of the BGP flapping?

130

A small company is moving their on-premises application to Google Cloud. They have a single on-premises office with a small router that supports IPsec VPN. They need a simple and low-cost connectivity solution that provides encryption and a consistent experience. They anticipate low bandwidth needs (under 100 Mbps). They also want the ability to use BGP for dynamic routing to avoid manual route updates. Which Google Cloud service should they use?

131

A company has a Dedicated Interconnect connection between their on-premises data center and Google Cloud. They have two VLAN attachments (vlan-100 and vlan-200) connected to two separate Cloud Routers in the same region. Each Cloud Router has a BGP session with the on-premises router. The on-premises router advertises the same prefixes (10.0.0.0/8) over both sessions. In Google Cloud, they have workloads in two different VPCs: VPC-A and VPC-B. They want traffic to VPC-A to use vlan-100, and traffic to VPC-B to use vlan-200. Cloud Router 1 is attached to VPC-A, Cloud Router 2 is attached to VPC-B. Currently, traffic from on-premises to VPC-A sometimes goes through vlan-200, causing asymmetric routing. What configuration change should they make to ensure traffic is symmetric?

132

A large enterprise has multiple on-premises data centers connected to Google Cloud via a combination of Dedicated Interconnect and Cloud VPN. They have a VPC with subnets in us-east1 and us-west1. The on-premises network advertises a prefix 10.0.0.0/8 to both Cloud Routers (each in different regions) via BGP. The Cloud Routers are configured with 'global' dynamic routing mode. The network team notices that traffic from Google Cloud instances in us-west1 to on-premises destinations in 10.0.0.0/8 is always taking the path to the closest on-premises data center (west coast) even though the west coast data center is currently under high load, causing performance degradation. The east coast data center is underutilized. They want to influence the path selection so that the west coast instances prefer the east coast data center during peak times. They are using BGP. What is the most effective method to achieve this?

133

A company has deployed Cloud HA VPN between their on-premises network and Google Cloud. They have two tunnels from the on-premises VPN appliance to the HA VPN gateway. The on-premises appliance uses a single public IP address for both tunnels, while the Cloud VPN gateway uses two different public IPs. BGP sessions are established over both tunnels, and the Cloud Router is configured with 'active/active' mode. The network team notices that all outbound traffic from Google Cloud to on-premises is using only one of the two tunnels, even though both tunnels are up. BGP metrics are identical for routes received over both sessions. What is the most likely cause?

134

A company is planning to connect their on-premises data center to Google Cloud. They require high bandwidth (10 Gbps) and low latency for real-time data replication. They also want a cost-effective solution that supports burstable traffic. Which TWO connectivity options should they consider? (Choose TWO.)

135

Your organization has a site-to-site Cloud VPN connection between an on-premises network with CIDR 10.0.0.0/8 and a VPC in us-central1 with subnet 192.168.1.0/24. The VPN tunnel is established, but you cannot reach a Compute Engine instance with internal IP 192.168.1.10 from a server on-premises with IP 10.0.0.50. Cloud VPN logs show no errors. On-premises firewall rules allow all outbound traffic. What is the most likely cause of the problem?

136

A financial institution is setting up Dedicated Interconnect with Google Cloud. They have two on-premises routers (R1 and R2) each connected to a separate Google Cloud router via VLAN attachments in two different zones (us-central1-a and us-central1-b). The on-premises routers are configured with BGP, and they advertise the corporate prefix 10.0.0.0/8. Google Cloud routers are configured with custom route advertisements. After provisioning, you notice that traffic from some on-premises subnets to GCP experiences asymmetrical routing, causing packet drops. You verify that both BGP sessions are established and that both Cloud Routers have received the 10.0.0.0/8 route. What is the most likely cause of the asymmetrical routing?

137

A company currently uses a site-to-site Cloud VPN (IPsec) to connect their on-premises network to a VPC. Due to growing bandwidth demands, they plan to migrate to Partner Interconnect using a supported service provider. They have ordered a 1 Gbps connection and the provider has indicated the VLAN attachment is ready. After creating the VLAN attachment and pairing it with a Cloud Router, the on-premises router sees the BGP session come up, but no traffic is forwarded over the interconnect. The Cloud VPN is still operational. What step is most likely missing?

138

A large enterprise has two on-premises data centers (DC1 and DC2) connected to Google Cloud via two separate VPN tunnels to the same VPC. Each tunnel terminates on a different Cloud VPN gateway (gateway1 in us-east1, gateway2 in us-west1). The on-premises routers advertise the same CIDR 172.16.0.0/12 from both DCs. Cloud Router is configured with BGP and uses default route priority. You notice that after a failover event where one tunnel goes down, traffic continues to flow, but there is a significant increase in latency for traffic coming from GCP to on-premises. You verify that both tunnels have re-established. What is the most likely cause of the increased latency?

139

A company has a Cloud VPN tunnel with dynamic routing (BGP) connecting their on-premises network to a VPC in us-central1. They recently added a new subnet (10.2.0.0/16) to the VPC. The on-premises network still cannot reach resources in the new subnet. The Cloud Router BGP session is established and routes from on-prem are being received. What is the most likely cause?

140

A financial services firm needs to connect their on-premises data center to Google Cloud VPC with 50 Gbps of bandwidth and latency under 5 ms. They are in a metropolitan area with a Google Cloud region. They require an SLA of 99.99% and need to support VLAN attachments to multiple VPCs. Which connectivity option should they choose?

141

An organization has two Cloud VPN tunnels from the same on-premises router to a Cloud Router in Google Cloud. Both tunnels are using BGP, and the on-premises router is sending the same routes over both tunnels. The Cloud Router is configured to use 'route propagation' from a VPC network. Which of the following is true regarding route priority?

142

A company has a VPC with subnets in us-east1 and us-west1. They have established a Cloud VPN tunnel to their on-premises network through a Cloud Router in us-east1. They want to ensure that traffic from on-premises to resources in us-west1 uses the VPN tunnel and not the public internet. What must be configured?

143

A network engineer is troubleshooting a BGP session between an on-premises router and a Cloud Router. The BGP session state is 'CONNECT' and never transitions to 'ESTABLISHED'. The engineer has verified that the Cloud Router and on-premises router have the same BGP ASN, and that the peer IP addresses are correctly configured. Which two additional steps should the engineer take to resolve this issue? (Choose TWO.)

144

Your company has two on-premises data centers, DC1 and DC2, each connected to a separate Google Cloud VPC via Dedicated Interconnect. Both VPCs are connected via VPC Network Peering. A new application deployed in VPC1 needs to communicate with a database in DC2. The database IP range is 10.0.0.0/16. You have configured firewall rules to allow the traffic. However, the application cannot reach the database. You have verified that routes for 10.0.0.0/16 exist in VPC1's route table with next hop to VPC Peering, and in VPC2's route table with next hop to the interconnect attachment. The BGP sessions on both interconnects are up. What is the most likely reason for the connectivity failure?

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