CCNP Practice Test 8 — 10 Questions

Question 1

A company is deploying a virtualized network function (VNF) on a KVM-based host. The VNF requires dedicated CPU cores and must avoid performance interference from other VMs. Which hypervisor configuration best meets these requirements?

Accepted Answer

Configure CPU pinning and use dedicated NUMA nodes.. Option B is correct because CPU pinning binds the VNF's vCPUs to specific physical cores, ensuring dedicated CPU resources and preventing interference from other VMs. Using dedicated NUMA nodes further optimizes memory locality, reducing latency and avoiding cross-NUMA memory access, which is critical for performance-sensitive VNFs.

Answer

Enable CPU overcommitment and use a single NUMA node.

Answer

Use VMware vSphere with DRS set to Aggressive.

Answer

Deploy the VNF as a container instead of a VM.

Question 2

An engineer is deploying a virtual router (vRouter) on a Cisco NFVIS host. The vRouter needs to advertise routes to a physical router connected to the host's management port. The engineer configures the vRouter with an IP address on the same subnet as the management port. However, the physical router does not receive any routing updates. What should the engineer do to enable route exchange?

Accepted Answer

Connect the vRouter to a data plane interface (e.g., a bridge connected to a physical data port) instead of the management port.. Option D is correct because in Cisco NFVIS, the management port is isolated from the data plane and is intended only for out-of-band management traffic. Routing protocols like OSPF or BGP cannot exchange routes over the management interface because it lacks the necessary data-plane forwarding capabilities. To advertise routes to a physical router, the vRouter must be connected to a data plane interface, such as a bridge mapped to a physical data port, which supports routing protocol adjacency and packet forwarding.

Answer

Configure a static route on the vRouter pointing to the physical router.

Answer

Enable OSPF on the vRouter's management interface.

Answer

Change the management port to a trunk port to carry routing updates.

Question 3

A service provider wants to deploy a virtualized firewall as a VNF in a service chain. The VNF must be inserted transparently into the traffic path without requiring changes to the existing IP addressing. Which service chaining method should the architect choose?

Accepted Answer

Implement policy-based routing (PBR) to redirect traffic to the VNF.. Policy-based routing (PBR) allows the architect to redirect traffic to the VNF based on match criteria such as source/destination IP or protocol, without altering the existing IP addressing scheme. This enables transparent insertion of the VNF into the service chain, as PBR overrides the routing table for selected traffic and forwards it to the virtualized firewall, while the original IP headers remain unchanged.

Answer

Use static routing to point traffic to the VNF.

Answer

Deploy the VNF in inline mode with proxy ARP.

Answer

Use VRF-lite to separate traffic and route through the VNF.

Question 4

Examine the following configuration snippet:

interface GigabitEthernet0/1
 ip address 192.168.1.1 255.255.255.0
 ip ospf hello-interval 20
 ip ospf dead-interval 80

What is the effect of this configuration?

Accepted Answer

The OSPF hello interval is changed to 20 seconds, and the dead interval is changed to 80 seconds, maintaining the default 4:1 ratio.. Option A is correct because the configuration explicitly sets the OSPF hello interval to 20 seconds and the dead interval to 80 seconds, which maintains the default 4:1 ratio (dead = hello × 4). OSPF allows manual configuration of these timers, and as long as both sides of the adjacency match, the ratio can be any value; the 4:1 default is not enforced by the protocol.

Answer

The OSPF hello interval is changed to 20 seconds, but the dead interval remains at the default of 40 seconds.

Answer

The OSPF hello interval is changed to 20 seconds, and the dead interval is automatically set to 60 seconds.

Answer

This configuration will cause OSPF adjacency failure because the dead interval must be exactly 4 times the hello interval.

Question 5

Drag and drop the steps of VNF service chain instantiation into the correct order, from first to last.

Accepted Answer

Define service chain requirements. Service chain instantiation begins with defining the chain, then selecting VNFs, allocating resources, connecting VNFs via virtual links, and finally testing the chain to verify functionality.

Question 6

Drag and drop the steps of VNF life cycle management into the correct order, from first to last.

Accepted Answer

Onboard VNF package into NFVI. The correct order follows the ETSI NFV lifecycle: first onboard the VNF package, then instantiate the VNF, configure the VNF, scale the VNF as needed, and finally terminate the VNF when no longer required.

Question 7

Drag and drop the steps of deploying a virtual router as a VNF into the correct order, from first to last.

Accepted Answer

Upload virtual router image to hypervisor. Deploying a virtual router VNF starts with uploading the image, then creating the VM, attaching virtual interfaces, configuring routing protocols, and finally verifying connectivity.

Question 8

A network engineer is designing a disaster recovery solution using VMware vSphere. The engineer needs to replicate virtual machines from the primary site to a secondary site with minimal downtime. The application VMs are running on NFS datastores. The engineer plans to use vSphere Replication. What prerequisite must be met for vSphere Replication to work with NFS datastores?

Accepted Answer

The NFS datastores must be mounted on both the source and target ESXi hosts.. vSphere Replication operates at the hypervisor level, replicating VM data from the source ESXi host to the target ESXi host. For NFS datastores, the source and target hosts must each have the NFS datastore mounted because vSphere Replication reads the VM files from the source NFS mount and writes them to the target NFS mount. Without both mounts, the replication engine cannot access the source data or place the replica on the target storage.

Answer

The NFS datastores must be backed by a storage array that supports snapshot offloading.

Answer

The VMs must be configured with thick provisioning eager zeroed disks.

Answer

The NFS datastores must be part of a vSAN cluster.

Question 9

A network administrator is troubleshooting a DHCP snooping issue on a Cisco switch. The switch is configured with DHCP snooping globally and on VLAN 10. The trusted interface is GigabitEthernet0/1 connected to the DHCP server. However, clients on VLAN 10 are not receiving IP addresses from the DHCP server. What is the most likely cause?

Accepted Answer

The interface GigabitEthernet0/1 is not configured as a trusted port for DHCP snooping.. Option B is correct because the scenario states that DHCP snooping is configured globally and on VLAN 10, and that GigabitEthernet0/1 is connected to the DHCP server. However, for DHCP snooping to allow DHCP server messages (OFFER, ACK) to be forwarded, the interface connected to the legitimate DHCP server must be explicitly configured as a trusted port using the 'ip dhcp snooping trust' interface command. Without this, the switch treats all DHCP server responses as untrusted and drops them, preventing clients from receiving IP addresses.

Answer

The switch has IP Source Guard enabled, blocking valid DHCP traffic.

Answer

The DHCP server is on a different subnet and the switch lacks an IP helper address.

Answer

The DHCP server is sending offers too quickly, exceeding the rate-limit on the switch.

Question 10

Which BGP attribute is preferred when it has the lowest value?

Accepted Answer

MED (Multi-Exit Discriminator). The Multi-Exit Discriminator (MED) is a BGP attribute used to influence inbound traffic from neighboring ASes. A lower MED value is preferred when multiple paths are received from the same neighboring AS, making it the correct answer for an attribute preferred with the lowest value.

Answer

Weight

Answer

Local Preference

Answer

AS Path Length