Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 121:

  Which two options are mandatory components of a multiprotocol BGP VPN-IPv4 address? (Choose two.)

  A. a route distinguisher
  B. an IPv4 address
  C. a route target
  D. an MPLS label
  E. a system ID
  F. an area ID
  A. a route distinguisher
  B. an IPv4 address

  ---

  The IP prefix is a member of the IPv4 address family. After the PE device learns the IP prefix, the PE converts it into a VPN-IPv4 prefix by combining it with an 8- byte route distinguisher (RD). The generated prefix is a member of the VPNIPv4 address family. It uniquely identifies the customer address, even if the customer site is using globally nonunique (unregistered private) IP addresses. The route distinguisher used to generate the VPN-IPv4 prefix is specified by a configuration command associated with the virtual routing and forwarding (VRF) instance on the PE device.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15- mt/mp-l3-vpns-15-mt-book/mp-bgp-mpls-vpn.html

• Question 122:

  Refer to the exhibit.

  

  RIPv2 authentication is failing on a device with this configuration. Which two actions can you take to enable it? (Choose two.)

  A. Set the RIP authentication mode to text.
  B. Set the RIP authentication mode to MD5.
  C. Configure the password encryption for the key.
  D. Set the password encryption to AES.
  A. Set the RIP authentication mode to text.
  B. Set the RIP authentication mode to MD5.

  ---

  See the reference link below for information on configuring RIPv2 authentication, including both test and MD5 modes. Reference: http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol- rip/13719-50.html#configuringplain

• Question 123:

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

  A. It facilitates zero-touch configuration for addition of new spokes.
  B. It supports dynamically addressed spokes using DHCP.
  C. It features automatic IPsec triggering for building an IPsec tunnel.
  D. It requires uses of IPsec to build the DMVPN cloud.
  E. Spokes can build tunnels to other spokes and exchange traffic directly.
  F. It supports server load balancing on the spokes.
  A. It facilitates zero-touch configuration for addition of new spokes.
  C. It features automatic IPsec triggering for building an IPsec tunnel.
  E. Spokes can build tunnels to other spokes and exchange traffic directly.

• Question 124:

  Which two statements about the STP dispute function are true? (Choose two)

  A. It compares the downstream port states reported in received BPDUs.
  B. The upstream switch uses received BPDUs to detect unidirectional link failures.
  C. The downstream switch uses received BPDUs to detect unidirectional link failures.
  D. When a designated port detects a conflict, it changes its role by reverting to a discarding state.
  A. It compares the downstream port states reported in received BPDUs.
  B. The upstream switch uses received BPDUs to detect unidirectional link failures.

• Question 125:

  Which statement describes the purpose of the Payload Type field in the RTP header?

  A. It identifies the signaling protocol.
  B. It identifies the codec.
  C. It identifies the port numbers for RTP.
  D. It identifies the port numbers for RTCP.
  B. It identifies the codec.

  ---

  PT, Payload Type. 7 bits: Identifies the format of the RTP payload and determines its interpretation by the application. A profile specifies a default static mapping of payload type codes to payload formats. Additional payload type codes may be defined dynamically through non-RTP means. An RTP sender emits a single RTP payload type at any given time; this field is not intended for multiplexing separate media streams. A full list of codecs and their payload type values can be found at the link below:

  Reference: http://www.networksorcery.com/enp/protocol/rtp.htm

• Question 126:

  Which option describes the effect of the command ip route vrf DMZ 192.168.0.0 255.255.0.0

  172.16.5.5 global?

  A. It creates a static route in the global routing table for 192.168.0.0 255.255.0.0, and the next hop is in the VRF DMZ.
  B. It creates a static route in the global routing table for 192.168.0.0 255.255.0.0 and the next hop is in the global routing table.
  C. It creates a static default route in the VRF DMZ; and the next hop is in the global routing table.
  D. It creates a static route in the VRF DMZ for 192.168.0.0 255.255.0.0, and the next hop is in the VRF DMZ.
  E. It creates a static route in the VRF DMZ for 192.168.0.0 255.255.0.0, and the next hop is in the global routing table.
  E. It creates a static route in the VRF DMZ for 192.168.0.0 255.255.0.0, and the next hop is in the global routing table.

• Question 127:

  Which three values can be used to tag external EIGRP routes? (Choose three.)

  A. The router ID of the router that redistributed the route
  B. The administrative distance of the external protocol
  C. The protocol ID of the external protocol
  D. The cost to reach the router that redistributed the route
  E. The metric from the external protocol
  F. The router ID of the router from which the external protocol route was learned
  A. The router ID of the router that redistributed the route
  C. The protocol ID of the external protocol
  E. The metric from the external protocol

  ---

  EIGRP has the notion of internal and external routes. Internal routes are ones that have been originated within an EIGRP autonomous system (AS). Therefore, a directly attached network that is configured to run EIGRP is considered an

  internal route and is propagated with this information throughout the EIGRP AS. External routes are ones that have been learned by another routing protocol or reside in the routing table as static routes. These routes are tagged individually

  with the identity of their origination. External routes are tagged with the following information:

  The router ID of the EIGRP router that redistributed the route.

  The AS number where the destination resides.

  A configurable administrator tag.

  Protocol ID of the external protocol.

  The metric from the external protocol.

  Bit flags for default routing.

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway- routing-protocol-eigrp/13669-1.html#route_tagging

• Question 128:

  Which implementation can cause packet loss when the network includes asymmetric routing paths?

  A. the use of ECMP routing
  B. the use of penultimate hop popping
  C. the use of Unicast RPF
  D. disabling Cisco Express Forwarding
  C. the use of Unicast RPF

  ---

  When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network.

  Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html

• Question 129:

  Refer to the exhibit.

  

  You have just created a new VRF on PE3. You have enabled debug ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table. Which two statements are true? (Choose two.)

  A. VPNv4 is not configured between PE1 and PE3.
  B. address-family ipv4 vrf is not configured on PE3.
  C. After you configure route-target import 999:999 for a VRF on PE3, the route will be accepted.
  D. PE1 will reject the route due to automatic route filtering.
  E. After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted.
  D. PE1 will reject the route due to automatic route filtering.
  E. After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted.

  ---

  The route target extended community for VPLS auto-discovery defines the import and export policies that a VPLS instance uses. The export route target sets an extended community attribute number that is appended to all routes that are exported from the VPLS instance. The import route target value sets a filter that determines the routes that are accepted into the VPLS instance. Any route with a value in its import route target contained in its extended attributes field matching the value in the VPLS instance's import route target are accepted. Otherwise the route is rejected.

• Question 130:

  When VRF-Lite is configured without BGP support, which statement about the configuration of the route target and route distinguisher is true?

  A. The configuration of the route target and route distinguisher is required.
  B. The configuration of the route target and route distinguisher is not required.
  C. The configuration of the route target is required and the configuration of the route distinguisher is not required.
  D. The configuration of the route target is not required and the configuration of the route distinguisher is required.
  D. The configuration of the route target is not required and the configuration of the route distinguisher is required.