Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 921:

  Refer to the exhibit.

  

  Which two issues can cause the interface VLAN10 to be down/down? (Choose two.)

  A. The VLAN is inactive or has been removed from the VLAN database.
  B. STP is in a forwarding state on the port.
  C. A Layer 2 access port is configured with VLAN10, but is in a down/down state.
  D. The autostate exclude feature was used on interface VLAN10.
  A. The VLAN is inactive or has been removed from the VLAN database.
  C. A Layer 2 access port is configured with VLAN10, but is in a down/down state.

• Question 922:

  Which two conditions are required for tracking the interface IP routing state? (Choose two) A. A VRF must be enabled on the interface.

  B. IP routing must be disabled on the interface.
  C. Cisco Express Forwarding must be disabled on the interface.
  D. The interface line protocol must be up.
  E. A known IP address must be configured on the interface.
  D. The interface line protocol must be up.
  E. A known IP address must be configured on the interface.

• Question 923:

  Which function does PHP perform?

  A. popping the top label one hop before the egress LSR
  B. popping the top label at the egress LSR
  C. popping the bottom label one hop before the egress LSR
  D. popping the bottom label at the egress LSR
  E. popping the two topmost labels one hop before the egress LSR
  F. popping the two bottommost labels one hop before the egress LSR
  A. popping the top label one hop before the egress LSR

• Question 924:

  If OSPF fast hellos are configured on an interface and the hello-multiplier is set to 10, how frequently are hello packets are sent?

  A. every 200 milliseconds
  B. every 50 milliseconds
  C. every 100 milliseconds
  D. every 500 milliseconds
  C. every 100 milliseconds

• Question 925:

  Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP, and Cisco Express Forwarding?

  A. FlexVPN
  B. DMVPN
  C. GETVPN
  D. Cisco Easy VPN
  B. DMVPN

• Question 926:

  What are two reasons to define static peers in EIGRP? (Choose two.)

  A. Security requirements do not allow dynamic learning of neighbors.
  B. The link between peers requires multicast packets.
  C. Back-level peers require static definition for successful connection.
  D. The link between peers requires unicast packets.
  A. Security requirements do not allow dynamic learning of neighbors.
  D. The link between peers requires unicast packets.

  ---

  There are two ways we can create EIGRP neighbor relationship:

  + Use "network " command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets. + Use "neighbor" commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct.

• Question 927:

  Refer to the exhibit.

  

  Which action must you take to enable full reachability from router C to router D?

  A. Build an OSPF virtual link.
  B. Build an OSPF sham link.
  C. Configure mutual redistribution between OSPF and EIGRP on routers A and B.
  D. Add a static route on router D.
  C. Configure mutual redistribution between OSPF and EIGRP on routers A and B.

  ---

  For full connectivity, we need to configure mutual redistribution to advertise the EIGRP routes into OSPF and to advertise the OSPF routes into the EIGRP network. This needs to be done at the two border routers that connect to both the EIGRP and OSPF domains.

• Question 928:

  DRAG DROP

  Drag and drop the IGMPv2 timer on the left to its default value on the right.

  Select and Place:

  

  

• Question 929:

  If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table?

  A. The route whose originator has the lower router ID.
  B. Both routes are installed.
  C. The route whose originator has the higher router ID.
  D. The first route that is learned.
  B. Both routes are installed.

  ---

  OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table.

• Question 930:

  Which statement is true regarding the UDP checksum?

  A. It is used for congestion control.
  B. It cannot be all zeros.
  C. It is used by some Internet worms to hide their propagation.
  D. It is computed based on the IP pseudo-header.
  D. It is computed based on the IP pseudo-header.

  ---

  The method used to compute the checksum is defined in RFC 768:

  "Checksum is the 16-bit one's complement of the one's complement sum of a pseudo header of information from the IP header, the UDP header, and the data, padded with zero octets at the end (if necessary) to make a multiple of two

  octets." In other words, all 16-bit words are summed using one's complement arithmetic. Add the 16-bit values up. Each time a carry-out (17th bit) is produced, swing that bit around and add it back into the least significant bit. The sum is then

  one's complemented to yield the value of the UDP checksum field.

  If the checksum calculation results in the value zero (all 16 bits 0) it should be sent as the one's complement (all 1s).

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