Cisco 642-873 Online Practice Questions and Exam Preparation

Cisco 642-873 Online Questions & Answers

• Question 161:

  Which route summarization most efficiently reduces perceived network complexity that is composed of subnetworks ranging from 172.16.20.0/24 to 172.16.36.0/24?

  A. 172.16.8.0/21
  B. 172.16.8.0/19
  C. 172.16.20.0/20
  D. 172.16.0.0/18
  E. 172.16.20.0/19
  D. 172.16.0.0/18

• Question 162:

  Which option is a primary requirement for the deployment of an IPv6-enabled network via the native method (dual-stack model) within the enterprise campus environment?

  A. hardware-based switching support for IPv6 forwarding on all campus switches
  B. restriction of IPv6-enabled devices to the core layer
  C. manual implementation of tunneling between IPv6-incompatible devices in an IPv4-over- IPv6 tunnel
  D. disabling of multicast in the distribution layer prior to implementation of IPv6
  A. hardware-based switching support for IPv6 forwarding on all campus switches

• Question 163:

  Which option is a recommended firewall topology?

  A. using two firewalls with stateful failover switched mode
  B. using one firewall with NAT enabled in transparent mode
  C. using two firewalls in active/active mode
  D. using one firewall with stateful failover enabled in routed mode
  C. using two firewalls in active/active mode

• Question 164:

  A Layer 2 switch in the network has recently started broadcasting traffic out of every port and is impacting network performance. The engineering department determines that a MAC overflow attack is the cause. Which two features can protect and mitigate the damage of the attacks? (Choose two.)

  A. Storm Control
  B. Port Security
  C. SPAN
  D. BPDU Filters
  E. IP Source Guard
  F. VACLs
  A. Storm Control
  B. Port Security

• Question 165:

  Which network virtualization plane is used to separate traffic forwarding tables?

  A. control
  B. data
  C. management
  D. access
  B. data

• Question 166:

  A network team must provide a redundant secure connection between two entities using OSPF. The primary connection will be an Ethernet Private Line and the secondary connection will be a site-to-site VPN. What needs to be configured in order to support routing requirements for over the VPN connection?

  A. GRE Tunnel
  B. HTTPS
  C. Root Certificate
  D. AAA Server
  A. GRE Tunnel

• Question 167:

  Which VRF component ensures control plane separation between the different Layer 3 VPNs?

  A. FIB
  B. routing protocol instance
  C. RIB
  D. a subset of the router interfaces
  B. routing protocol instance

• Question 168:

  Click the Exhibit button.

  Refer to the exhibit. Which Layer 2 feature detects a link failure between the switch and router B that decreases OSPF reconvergence to approximately 50 milliseconds?

  A. BFD
  B. UDLD
  C. RSTP
  D. PVST+
  A. BFD

• Question 169:

  Which of the following is a result when designing multiple EIGRP autonomous systems within the Enterprise Campus network?

  A. Improves scalability by dividing the network using summary routes at AS boundaries
  B. Decreases complexity since EIGRP redistribution is automatically handled in the background
  C. Reduces the volume of EIGRP queries by limiting them to one EIGRP AS
  D. Scaling is improved when a unique AS is run at the Access, Distribution, and Core layers of the network
  A. Improves scalability by dividing the network using summary routes at AS boundaries

• Question 170:

  Which option is a benefit of the vPC+ feature?

  A. Cisco FabricPath is not required in the network domain.
  B. This feature provides fault domain separation.
  C. Nonfabric devices, such as a server or a classic Ethernet switch, can be connected to two fabric switches that are configured with vPC.
  D. The control plane and management plane are combined into one logical plane.
  C. Nonfabric devices, such as a server or a classic Ethernet switch, can be connected to two fabric switches that are configured with vPC.