WAN Technologies

A network engineer is configuring a DMVPN Phase 3 deployment with EIGRP as the routing protocol. The hub router has multiple spoke routers behind a single physical interface. The engineer notices that spoke-to-spoke traffic is being forwarded through the hub instead of directly. The spoke routers have the correct NHRP and mGRE configuration. What is the most likely cause of this issue?

An enterprise is replacing its legacy Frame Relay WAN with MPLS L3VPN. The new MPLS provider assigns a single VRF to the customer. The customer's CE routers are running BGP with the provider's PE routers. The engineer notices that the CE routers can ping the PE loopback addresses but cannot reach remote CE loopbacks. The BGP sessions are established and routes are received. What is the most likely cause?

A network engineer is troubleshooting a site-to-site IPsec VPN tunnel between two Cisco routers. The tunnel is established and IKEv2 Phase 1 is up, but no traffic passes. The engineer checks the crypto map and sees that the ACL is configured to permit traffic between the two LAN subnets. However, 'show crypto ipsec sa' shows that the number of packets encapsulated and decapsulated is zero. What is the most likely cause?

An engineer is configuring a FlexVPN hub-and-spoke topology using IKEv2. The hub router is configured with a dynamic crypto map and a local pool for assigning IP addresses to spokes. The spokes are configured with a static crypto map and a tunnel interface with an IP address from the pool. The tunnel comes up, but the spoke cannot ping the hub's tunnel interface. The hub can ping the spoke's tunnel interface. What is the most likely cause?

A company is using a dual-homed MPLS L3VPN connection with two different ISPs. The CE router is running eBGP with both PE routers. The engineer wants to ensure that inbound traffic from the Internet to the company's web servers uses both links, but outbound traffic from the company should prefer ISP A. The company advertises the same /24 prefix to both ISPs. What BGP configuration should the engineer apply on the CE router?

An engineer is deploying a new SD-WAN solution using Cisco vManage. The WAN edge routers are connected to two different transport networks: MPLS and Internet. The engineer wants to ensure that voice traffic is always sent over the MPLS link when available, and only fails over to the Internet link if the MPLS link goes down. The engineer has configured a policy to set the preferred color for voice traffic to 'mpls'. However, during a test, voice traffic is still using the Internet link even though the MPLS link is up. What is the most likely cause?

A network engineer is configuring a PPPoE client on a Cisco router for a DSL connection. The engineer configures the dialer interface with the correct PPPoE profile and authentication credentials. The PPPoE session establishes, but the router cannot ping the ISP's gateway IP address. The engineer checks the routing table and sees that a default route is present via the dialer interface. What is the most likely cause?

An engineer is troubleshooting a site-to-site VPN that uses IPsec with IKEv1. The tunnel is established, but traffic is intermittently dropped. The engineer checks the 'show crypto ipsec sa' output and sees that the number of packets that failed anti-replay check is increasing. What is the most likely cause of this issue?

A company is implementing a WAN optimization solution using Cisco WAAS. The engineer configures WAAS devices at the data center and remote branch. The WAAS devices are configured to use inline mode. However, the engineer notices that optimized traffic is not being intercepted. The WAAS devices are directly connected to the WAN router and the LAN switch. What is the most likely cause?

A network engineer runs the following command on Router R1: R1# show ip route 10.1.1.0 Routing entry for 10.1.1.0/24 Known via "bgp 65001", distance 200, metric 0 Tag 65002, type external Last update from 192.168.1.2 00:00:15 ago Routing Descriptor Blocks: * 192.168.1.2, from 192.168.1.2, 00:00:15 ago Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65002 MPLS label: 18 Based on this output, what can be concluded?

A network engineer executes the following command on Router R2: R2# show mpls ldp neighbor Peer LDP Ident: 192.168.1.1:0; Local LDP Ident 192.168.1.2:0 TCP connection: 192.168.1.1.646 - 192.168.1.2.54321 State: Oper; Msgs sent/rcvd: 1234/1234; Downstream Up time: 2d04h LDP discovery sources: GigabitEthernet0/0, Src IP addr: 192.168.1.1 holdtime: 15000 ms, hello interval: 5000 ms Addresses bound to peer LDP Ident: 192.168.1.1 10.0.0.1 Based on this output, what is true about the LDP session?

A network engineer issues the following command on Router R3: R3# show ip bgp summary BGP router identifier 10.0.0.3, local AS number 65003 BGP table version is 12345, main routing table version 12345 Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 192.168.1.1 4 65001 12345 12345 12345 0 0 1w2d 150 192.168.1.2 4 65002 12345 12345 12345 0 0 2w0d 200 Based on this output, what can be concluded?

A network engineer runs the following command on Router R4: R4# show interfaces tunnel 0 Tunnel0 is up, line protocol is up Hardware is Tunnel Internet address is 10.0.0.4/30 MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 192.168.1.4, destination 192.168.2.4 Tunnel protocol/transport GRE/IP Key disabled, sequencing disabled Checksumming of packets disabled Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/0 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out Based on this output, what is true about this tunnel?

A network engineer executes the following command on Router R5: R5# show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.0.0.6 1 FULL/DR 00:00:35 192.168.1.6 GigabitEthernet0/0 10.0.0.7 1 FULL/BDR 00:00:32 192.168.1.7 GigabitEthernet0/0 10.0.0.8 1 2WAY/DROTHER 00:00:38 192.168.1.8 GigabitEthernet0/0 Based on this output, what can be concluded about the OSPF network?

A network engineer issues the following command on Router R6: R6# show ip nat translations Pro Inside global Inside local Outside local Outside global --- 192.168.1.100 10.0.0.10 --- --- --- 192.168.1.101 10.0.0.11 --- --- udp 192.168.1.100:1234 10.0.0.10:1234 203.0.113.5:53 203.0.113.5:53 tcp 192.168.1.101:80 10.0.0.11:80 198.51.100.2:443 198.51.100.2:443 Based on this output, what is true about the NAT translations?

A network engineer runs the following command on Router R7: R7# show vrf brief Name Default RD Protocols Interfaces Mgmt-intf <not set> ipv4,ipv6 GigabitEthernet0/0 CUSTOMER-A 65001:100 ipv4 GigabitEthernet0/1.10 CUSTOMER-B 65001:200 ipv4 GigabitEthernet0/1.20 Based on this output, what can be concluded?

A network engineer issues the following command on Router R8: R8# show policy-map interface gigabitethernet 0/1 GigabitEthernet0/1 Service-policy output: SHAPE-1M Class-map: class-default (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any queue limit 64 packets (queue depth 0) (congestion occurrences) shape (average) cir 1000000, bc 10000, be 10000 target shape rate 1000000 Based on this output, what is true about the traffic shaping policy?

A network engineer runs the following command on Router R9: R9# show ip pim neighbor PIM Neighbor Table Neighbor Address Interface Uptime Expires Mode 192.168.1.10 GigabitEthernet0/0 1w2d 00:01:30 Dense 192.168.1.11 GigabitEthernet0/0 2w0d 00:01:25 Sparse 192.168.1.12 GigabitEthernet0/1 3d04h 00:01:28 Sparse Based on this output, what can be concluded?

interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip ospf network point-to-point ip ospf hello-interval 10 ! router ospf 1 network 192.168.1.0 0.0.0.255 area 0 What is the effect of this configuration?

interface Tunnel0 ip address 10.0.0.1 255.255.255.252 tunnel source GigabitEthernet0/0 tunnel destination 203.0.113.2 tunnel mode ipsec ipv4 ! crypto isakmp policy 10 authentication pre-share encryption aes 256 hash sha group 14 lifetime 86400 ! crypto isakmp key cisco123 address 203.0.113.2 ! crypto ipsec transform-set TSET esp-aes 256 esp-sha-hmac mode tunnel ! crypto map CMAP 10 ipsec-isakmp set peer 203.0.113.2 set transform-set TSET match address 100 ! interface GigabitEthernet0/0 crypto map CMAP ! access-list 100 permit ip 10.0.0.0 0.0.0.3 10.0.0.4 0.0.0.3 What is the effect of this configuration?

interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip ospf network broadcast ip ospf priority 0 ! router ospf 1 network 192.168.1.0 0.0.0.255 area 0 What is the effect of setting the OSPF priority to 0 on this interface?

interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.0 ip nat outside ! interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip nat inside ! access-list 1 permit 192.168.1.0 0.0.0.255 ! ip nat inside source list 1 interface GigabitEthernet0/0 overload What is the effect of this configuration?

interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.252 ip ospf network point-to-multipoint ip ospf hello-interval 30 ! router ospf 1 network 10.0.0.0 0.0.0.3 area 0 What is the effect of this configuration?

interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip ospf network non-broadcast ip ospf priority 1 ! router ospf 1 network 192.168.1.0 0.0.0.255 area 0 neighbor 192.168.1.2 What is the effect of this configuration?

What is the default OSPF hello interval on an Ethernet broadcast network?

Which BGP attribute is used as the first tie-breaker when multiple paths are available and the weight is equal?

What is the maximum hop count for EIGRP?

Drag and drop the steps of PPPoE session establishment into the correct order, from first to last.

Drag and drop the steps of IPsec IKEv2 tunnel establishment into the correct order, from first to last.

Drag and drop the steps of DMVPN phase 2 spoke-to-spoke tunnel establishment into the correct order, from first to last.

Drag and drop the steps of DMVPN Phase 1 spoke-to-hub tunnel setup into the correct order, from first to last.

Drag and drop the steps of DMVPN Phase 3 spoke-to-spoke shortcut creation into the correct order, from first to last.

Drag and drop the steps of Metro Ethernet E-Line service provisioning into the correct order, from first to last.

Drag and drop the steps of 4G/LTE WAN failover with IP SLA tracking into the correct order, from first to last.

Drag and drop the steps of FlexVPN IKEv2 spoke registration to hub into the correct order, from first to last.

Drag and drop the steps of DMVPN Phase 1 spoke-to-hub tunnel setup into the correct order, from first to last.

Drag and drop the steps of DMVPN Phase 3 spoke-to-spoke shortcut creation into the correct order, from first to last.

Drag and drop the steps of Metro Ethernet E-Line service provisioning into the correct order, from first to last.

Drag and drop the steps of 4G/LTE WAN failover with IP SLA tracking into the correct order, from first to last.

Drag and drop the steps of FlexVPN IKEv2 spoke registration to hub into the correct order, from first to last.

Drag and drop each WAN technology on the left to its matching OSI layer on the right.

Drag and drop each DMVPN phase on the left to its matching spoke-to-spoke capability on the right.

Drag and drop each leased line technology on the left to its matching speed on the right.

Drag and drop each WAN encapsulation on the left to its matching use case on the right.

Drag and drop each broadband type on the left to its matching technology on the right.

Drag and drop each WAN technology on the left to its matching layer on the right.

Drag and drop each DMVPN phase on the left to its matching spoke-to-spoke capability on the right.

Drag and drop each leased line technology on the left to its matching speed on the right.

Drag and drop each WAN encapsulation on the left to its matching use case on the right.

Drag and drop each broadband type on the left to its matching technology on the right.

Which two statements about MPLS Layer 3 VPNs are true? (Choose two.)

Which three statements about DMVPN phase 2 are true? (Choose three.)

Which two statements about IPsec VPNs are true? (Choose two.)

Which three statements about SD-WAN (Cisco Catalyst SD-WAN) are true? (Choose three.)

Which two statements about MPLS Layer 3 VPNs are true? (Choose two.)

Which three statements about IPsec VPNs are true? (Choose three.)

Which two statements about SD-WAN architecture are true? (Choose two.)

Which three statements about DMVPN Phase 3 are true? (Choose three.)