Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 471:

  What are the three HDLC operating modes? (Choose three.)

  A. normal response
  B. asynchronous balanced
  C. synchronous response
  D. asynchronous response
  E. normal balanced
  F. synchronous balanced
  A. normal response
  B. asynchronous balanced
  D. asynchronous response

• Question 472:

  Refer to the exhibit.

  

  What is a possible reason for the IPSec tunnel not establishing?

  A. The peer is unreachable.
  B. The transform sets do not match.
  C. The proxy IDs are invalid.
  D. The access lists do not match.
  D. The access lists do not match.

  ---

  Proxy Identities Not Supported

  This message appears in debugs if the access list for IPsec traffic does not match. 1d00h: IPSec(validate_transform_proposal): proxy identities not supported 1d00h: ISAKMP: IPSec policy invalidated proposal

  1d00h: ISAKMP (0:2): SA not acceptable!

  The access lists on each peer needs to mirror each other (all entries need to be reversible).

  This example illustrates this point. Peer A access-list 150 permit ip 172.21.113.0 0.0.0.255 172.21.114.0 0.0.0.255 access-list 150 permit ip host 15.15.15.1 host 172.21.114.123 Peer B access-list 150 permit ip 172.21.114.0 0.0.0.255 172.21.113.0 0.0.0.255 access-list 150 permit ip host 172.21.114.123 host 15.15.15.1

  Reference: http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike- protocols/5409-ipsec-debug-00.html#proxy

• Question 473:

  Which three options are results of the command no mpls ip propagate-ttl? (Choose three.)

  A. It prevents the TTL from being copied from the IP header to the MPLS header.
  B. It prevents the MPLS hops from being visible to a CE router when you perform a traceroute.
  C. A fixed TTL value of 255 is used for the first label of the IP packet.
  D. It prevents the TTL from being copied from the MPLS header back into the IP header.
  E. MPLS hops remain visible on a CE router when you perform a traceroute.
  F. A fixed TTL value of 1 is used for the first label of the IP packet.
  A. It prevents the TTL from being copied from the IP header to the MPLS header.
  B. It prevents the MPLS hops from being visible to a CE router when you perform a traceroute.
  C. A fixed TTL value of 255 is used for the first label of the IP packet.

• Question 474:

  Which two statements about proxy ARP are true? (Choose two.)

  A. It is supported on networks without ARP.
  B. It allows machines to spoof packets.
  C. It must be used on a network with the host on a different subnet.
  D. It requires larger ARP tables.
  E. It reduces the amount of ARP traffic.
  B. It allows machines to spoof packets.
  D. It requires larger ARP tables.

  ---

  Disadvantages of Proxy ARP Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach any destination simply by sending an ARP request. But using ARP for everything has disadvantages. These are some of the disadvantages: It increases the amount of ARP traffic on your segment. Hosts need larger ARP tables in order to handle IP-to-MAC address mappings. Security can be undermined. A machine can claim to be another in order to intercept packets, an act called "spoofing." It does not work for networks that do not use ARP for address resolution. It does not generalize to all network topologies. For example, more than one router that connects two physical networks.

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation- resolution/13718-5.html

• Question 475:

  Refer to the exhibit.

  

  How many EIGRP routes will appear in the routing table of R2?

  B. 1
  C. 2
  D. 3
  A

  ---

  EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with "no shutdown" command) then we would see the prefix of the loopback interface of R1 in the routing table of R2.

  

  Note. EIGRPv6 requires the "ipv6 unicast-routing" global command to be turned on first or it will not work.

• Question 476:

  Refer to the exhibit.

  

  Which two route types are advertised by a router with this configuration? (Choose two.)

  A. connected
  B. external
  C. summary
  D. static
  E. redistributed
  A. connected
  C. summary

• Question 477:

  Which statement about the spanning-tree portfast feature on the switch is true?

  A. If an interface is enabled for portfast receives BDPU, the port goes through the spanning-tree listening, learning, and forwarding states.
  B. If an interface is enabled for portfast receives BDPU, the port does not go through the spanning-tree listening, learning, and forwarding states.
  C. If an interface is enabled for portfast receives BDPU, the port is shut down immediately.
  D. If an interface is enabled for portfast receives BDPU, the port goes into the spanning- tree inconsistent state.
  A. If an interface is enabled for portfast receives BDPU, the port goes through the spanning-tree listening, learning, and forwarding states.

• Question 478:

  Which EEM event detector is triggered by hardware installation or removal?

  A. Enhanced-Object-Tracking Event Detector
  B. Resource Event Detector
  C. OIR Event Detector
  D. CLI Event Detector
  C. OIR Event Detector

• Question 479:

  Which technology is an application of MSDP, and provides load balancing and redundancy between the RPs?

  A. static RP
  B. PIM BSR
  C. auto RP
  D. anycast RP
  D. anycast RP

  ---

  Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.

  Reference: www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html

• Question 480:

  With which ISs will an IS-IS Level 1 IS exchange routing information?

  A. Level 1 ISs
  B. Level 1 ISs in the same area
  C. Level 1 and Level 2 ISs
  D. Level 2 ISs
  B. Level 1 ISs in the same area

  ---

  IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Level 2 routers are inter area routers that can only form relationships with other Level 2 routers. Routing information is exchanged between Level 1 routers and other Level 1 routers, and Level 2 routers only exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.

  Reference: http://en.wikipedia.org/wiki/IS-IS