350-601 Network Practice Test 2 — 15 Questions

Question 1

You are a network engineer at a financial institution. The company has two data centers: DC1 and DC2, connected via a dark fiber link. Each data center has a pair of Nexus 7000 switches in a vPC configuration. The dark fiber link connects to a port on each Nexus 7000 pair using a Layer 2 port-channel. The requirement is to extend VLAN 100 between the two data centers for a critical application that requires a stretched Layer 2 domain. The current configuration has the port-channel on both sides set to mode 'active' with LACP. VLAN 100 is allowed on the trunk. The application servers report intermittent connectivity issues, with some packets being dropped. Upon inspection, you notice that the MAC address table on the Nexus 7000 in DC1 shows the MAC address of the server in DC2 on the dark fiber port-channel interface, but also on a local access port connected to a different server in the same VLAN. What is the most likely cause of the intermittent connectivity?

Accepted Answer

Spanning Tree Protocol is not blocking one of the redundant paths, creating a loop.. The MAC address table showing the same MAC address on both the dark fiber port-channel and a local access port indicates a Layer 2 loop. In a vPC environment with a Layer 2 extension between data centers, Spanning Tree Protocol (STP) should block one of the redundant paths to prevent loops. If STP fails to block the appropriate port, frames loop, causing MAC address flapping and intermittent packet drops.

Answer

The dark fiber link is experiencing high latency, causing MAC address timeouts.

Answer

LACP is misconfigured on one side, causing the port-channel to operate as individual links.

Answer

There is an asymmetric routing issue between the data centers.

Question 2

Arrange the steps to configure a vPC domain on a pair of Cisco Nexus switches.

Question 3

Arrange the steps to create a service profile template in Cisco UCS Manager.

Question 4

Match each Cisco data center technology to its primary purpose.

Question 5

Match each Cisco UCS Manager CLI command to its function.

Question 6

A network engineer is configuring a VPC peer-link on a Nexus switch. Which interface configuration is required for the peer-link port-channel?

Accepted Answer

switchport mode trunk. A VPC peer-link is a special port-channel that carries control traffic (e.g., Cisco Fabric Services over Ethernet) and data traffic between VPC peer switches. It must be configured as a trunk (switchport mode trunk) to allow multiple VLANs, including the VPC VLAN and the peer-keepalive link VLAN, to traverse the link. Without trunk mode, the peer-link cannot properly forward the necessary VLAN traffic for VPC operation.

Answer

spanning-tree port type edge trunk

Answer

switchport mode access

Answer

no switchport

Question 7

In a VXLAN EVPN fabric, which protocol is used to exchange MAC and IP address reachability information among VTEPs?

Accepted Answer

BGP. In a VXLAN EVPN fabric, BGP (Border Gateway Protocol) is used as the control plane protocol to exchange MAC and IP address reachability information among VTEPs. Specifically, MP-BGP (Multiprotocol BGP) with EVPN address family (AFI L2VPN / SAFI EVPN) carries Type-2 routes (MAC/IP advertisement) to distribute host reachability across the overlay network, enabling efficient MAC learning and ARP suppression.

Answer

IS-IS

Answer

EIGRP

Answer

OSPF

Question 8

A network engineer is troubleshooting an OSPF adjacency issue between two Nexus switches. The neighbors are stuck in the EXSTART state. What is the most likely cause?

Accepted Answer

MTU mismatch. An MTU mismatch prevents the exchange of Database Description packets, causing neighbors to remain in EXSTART. Other options cause different adjacency states.

Answer

Hold timer mismatch

Answer

Incorrect area ID

Answer

Duplicate router ID

Question 9

Which statement is true about the VLANs carried on a VPC peer-link?

Accepted Answer

The peer-link carries all VLANs that are allowed on the trunk interface.. In a vPC domain, the peer-link is a special trunk that carries all VLANs allowed on the trunk interface, including those not present on any member port. This ensures that orphaned traffic (traffic arriving on the peer-link destined for a device connected to the other vPC peer) can be forwarded correctly. The peer-link must carry all VLANs to maintain Layer 2 connectivity and loop-free behavior without relying on spanning tree.

Answer

The peer-link carries only the VLANs allowed on the member interfaces.

Answer

The peer-link requires spanning-tree port type edge trunk configuration.

Answer

The peer-link must be configured as a layer 3 interface.

Question 10

In a centralized anycast gateway VXLAN EVPN design, which is a requirement?

Accepted Answer

All VTEPs share a common anycast IP address for the default gateway.. In a centralized anycast gateway VXLAN EVPN design, all VTEPs share a common anycast IP address and MAC address for the default gateway. This allows any VTEP to serve as the first-hop router for hosts, enabling optimal east-west traffic forwarding without requiring a separate gateway device. The anycast IP is configured on each VTEP's VLAN interface, and the same IP/MAC is advertised via EVPN Type-2 routes.

Answer

Each VTEP has a unique anycast IP address.

Answer

The anycast gateway is configured on the spine switches.

Answer

The route reflector is an external BGP speaker.

Question 11

A network engineer notices that when a host sends a packet to a destination on a different VTEP, the packet is flooded to all VTEPs even though the destination MAC is known. What is the most likely cause?

Accepted Answer

The BGP EVPN route table is missing the MAC/IP route for the destination.. In a BGP EVPN VXLAN fabric, when a host sends a packet to a known destination MAC on a different VTEP, the ingress VTEP should perform MAC/IP route lookup in the BGP EVPN route table to determine the correct remote VTEP. If the MAC/IP route for the destination is missing (e.g., not advertised or withdrawn), the ingress VTEP has no mapping to a remote VTEP and must flood the packet to all VTEPs in the VNI, causing unnecessary broadcast traffic. This is the most likely cause of the described behavior.

Answer

The VNI is misconfigured.

Answer

The MTU exceeds 1500 bytes.

Answer

ARP suppression is disabled.

Question 12

After adding a new spine switch to a VXLAN EVPN fabric with OSPF underlay, some leaf switches experience routing instability. Which action could resolve the instability?

Accepted Answer

Increase the OSPF cost on the leaf-to-spine links.. When a new spine switch is added to a VXLAN EVPN fabric with an OSPF underlay, the leaf switches may experience routing instability because the new spine advertises routes with a lower cost, causing traffic to shift abruptly. Increasing the OSPF cost on the leaf-to-spine links makes those paths less preferred, stabilizing the routing table by preventing flapping and ensuring a more gradual convergence.

Answer

Configure OSPF neighbor authentication.

Answer

Decrease the OSPF hello timer.

Answer

Enable OSPF route summarization on the leaves.

Question 13

Which command displays the VLANs allowed on a trunk interface?

Accepted Answer

show interface trunk. The 'show interface trunk' command displays trunk parameters, including the VLANs allowed on the trunk interface. This command shows the trunking mode, encapsulation (e.g., 802.1Q), and the allowed VLAN list for each trunk port. It is the direct command to verify which VLANs are permitted on a specific trunk link.

Answer

show running-config interface

Answer

show vlan

Answer

show interface switchport

Question 14

In a VXLAN EVPN multi-tier design, which feature ensures traffic between leaf switches takes the optimal path without hair-pinning through a spine?

Accepted Answer

ECMP. C is correct because Equal-Cost Multipath (ECMP) in a VXLAN EVPN multi-tier design allows leaf switches to load-balance traffic across multiple equal-cost spine paths, ensuring that traffic between leaf switches takes the most direct route without being forced to hair-pin through a spine. ECMP leverages the underlying IP fabric's routing to forward VXLAN-encapsulated packets over any available spine, avoiding suboptimal forwarding that would occur if a single spine were used as a relay.

Answer

Anycast gateway

Answer

Type-2 routes

Answer

ARP suppression

Question 15

A network engineer is verifying VPC configuration on a pair of Nexus switches. Which two commands should be used to check VPC status and consistency? (Choose two.)

Accepted Answer

show vpc consistency-parameters. Option D (show vpc) is correct because it displays the overall VPC status, including the local and peer VPC system MAC, role, and the operational state of each VPC member port. Option B (show vpc consistency-parameters) is correct because it verifies that critical parameters (e.g., STP mode, VLAN interfaces, MTU) are consistent between the two VPC peers, which is essential for VPC to function correctly and avoid traffic black-holing.

Answer

show vpc role

Answer

show vpc peer-keepalive

Answer

show vpc statistics