Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 501:

  Refer to the exhibit.

  

  A tunnel is configured between R3 to R4 sourced with their loopback interfaces. The ip pim sparse-dense mode command is configured on the tunnel interfaces and multicast-routing is enabled on R3 and R4. The IP backbone is not

  configured for multicast routing.

  The RPF check has failed toward the multicast source.

  Which two conditions could have caused the failure? (Choose two.)

  A. The route back to the RP is through a different interface than tunnel 0.
  B. The backbone devices can only route unicast traffic.
  C. The route back to the RP is through the same tunnel interface.
  D. A static route that points the RP to GigabitEthernet1/0 is configured.
  A. The route back to the RP is through a different interface than tunnel 0.
  D. A static route that points the RP to GigabitEthernet1/0 is configured.

  ---

  or a successful RPF verification of multicast traffic flowing over the shared tree (*,G) from RP, an ip mroute rp-address nexthop command needs to be configured for the RP address, that points to the tunnel interface.

  A very similar scenario can be found at the reference link below:

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/43584-mcast-over- gre.html

• Question 502:

  Which three statements about the default behaviour of eBGP sessions are true? (Choose three.)

  A. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged.
  B. The next hop in an eBGP peering is the IP address of the neighbor that announced the route.
  C. When a route reflector reflects a route to a client, it transmits the next hop unchanged.
  D. The next hop in an eBGP peering is the loopback address of the interface that originated the route.
  E. The next hop in an eBGP peering is the loopback address of the neighbor that announced the route.
  F. When a route reflector reflects a route to a client, it changes the next hop to its own address.
  A. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged.
  B. The next hop in an eBGP peering is the IP address of the neighbor that announced the route.
  C. When a route reflector reflects a route to a client, it transmits the next hop unchanged.

• Question 503:

  What is the purpose of EIGRP summary leaking?

  A. to allow a summary to be advertised conditionally on specific criteria
  B. to allow a component of a summary to be advertised in addition to the summary
  C. to allow overlapping summaries to exist on a single interface
  D. to modify the metric of the summary based on which components of the summary are operational
  B. to allow a component of a summary to be advertised in addition to the summary

  ---

  When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here.

  http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685.

• Question 504:

  Which IP SLA operation requires Cisco endpoints?

  A. UDP Jitter for VoIP
  B. ICMP Path Echo
  C. ICMP Echo
  D. UDP Jitter
  A. UDP Jitter for VoIP

• Question 505:

  Which two options are two characteristics of the HSRPv6 protocol? (Choose two.)

  A. It uses virtual MAC addresses 0005.73a0.0000 through 0005.73a0.0fff.
  B. It uses UDP port number 2029.
  C. It uses virtual MAC addresses 0005.73a0.0000 through 0005.73a0.ffff.
  D. It uses UDP port number 2920.
  E. If a link local IPv6 address is used, it must have a prefix.
  A. It uses virtual MAC addresses 0005.73a0.0000 through 0005.73a0.0fff.
  B. It uses UDP port number 2029.

  ---

  HSRP IPv6 Virtual MAC Address Range

  HSRP IPv6 uses a different virtual MAC address block than does HSRP for IP:

  0005.73A0.0000 through 0005.73A0.0FFF (4096 addresses) HSRP IPv6 UDP Port Number

  Port number 2029 has been assigned to HSRP IPv6.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15- sy/fhp-15-sy-book/HSRP-for-IPv6.html

• Question 506:

  Which two statements are true about IPv6 multicast? (Choose two.)

  A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group.
  B. The PIM router with the lowest IPv6 address becomes the DR for the LAN.
  C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.
  D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.
  C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.
  D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.

  ---

  Multicast addresses in IPv6 have the prefix ff00::/8.

  Well-known IPv6 multicast addresses Address Description ff02::1 All nodes on the local network segment ff02::2 All routers on the local network segment

  Reference: http://en.wikipedia.org/wiki/Multicast_address

• Question 507:

  Which three technologies can be used to implement redundancy for IPv6? (Choose three)

  A. IPv6 NA
  B. NHRP
  C. HSRP
  D. DVMRP
  E. GLBP
  F. IPv6 RA
  C. HSRP
  E. GLBP
  F. IPv6 RA

• Question 508:

  Which two operating modes does VPLS support? (Choose two.)

  A. transport mode
  B. strict mode
  C. port mode
  D. loose mode
  E. VLAN mode
  F. dynamic mode
  C. port mode
  E. VLAN mode

• Question 509:

  The OSPF database of a router shows LSA types 1, 2, 3 and 7 only. Which type of area is this router connected to?

  A. backbone area
  B. totally stubby area
  C. stub area
  D. not-so-stubby area
  D. not-so-stubby area

• Question 510:

  Which two features improve BGP convergence? (Choose two.)

  A. next-hop address tracking
  B. additional paths
  C. advertise map
  D. communities
  E. soft reconfiguration
  A. next-hop address tracking
  B. additional paths

  ---

  The BGP Support for Next-Hop Address Tracking feature is enabled by default when a supporting Cisco software image is installed. BGP next-hop address tracking is event driven. BGP prefixes are automatically tracked as peering sessions are established. Next- hop changes are rapidly reported to the BGP routing process as they are updated in the RIB. This optimization improves overall BGP convergence by reducing the response time to next-hop changes for routes installed in the RIB. When a best path calculation is run in between BGP scanner cycles, only next-hop changes are tracked and processed. BGP routers and route reflectors (RRs) propagate only their best path over their sessions. The advertisement of a prefix replaces the previous announcement of that prefix (this behavior is known as an implicit withdraw). The implicit withdraw can achieve better scaling, but at the cost of path diversity. Path hiding can prevent efficient use of BGP multipath, prevent hitless planned maintenance, and can lead to MED oscillations and suboptimal hot-potato routing. Upon nexthop failures, path hiding also inhibits fast and local recovery because the network has to wait for BGP control plane convergence to restore traffic. The BGP Additional Paths feature provides a generic way of offering path diversity; the Best External or Best Internal features offer path diversity only in limited scenarios. The BGP Additional Paths feature provides a way for multiple paths for the same prefix to be advertised without the new paths implicitly replacing the previous paths. Thus, path diversity is achieved instead of path hiding.

  References: http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15- 1sg/irg-nexthop-track.html http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s- book/bgp_additional_paths.html