Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 831:

  Which two statements about the default router settings for SSH connections are true? (Choose two.)

  A. The default timeout value for the SSH negotiation phase is 120 seconds.
  B. Data is exchanged in clear text by default unless AAA authentication is enabled on the console.
  C. The default number of authentication retries is 3.
  D. SSH is enabled by default when you configure the username command.
  A. The default timeout value for the SSH negotiation phase is 120 seconds.
  C. The default number of authentication retries is 3.

  ---

  ip ssh {timeout seconds | authentication-retries number}

  Configures the SSH control parameters:

  Specify the time-out value in seconds; the default is 120 seconds. The range is 0 to 120 seconds. This parameter applies to the SSH negotiation phase. After the connection is established, the Switch uses the default time-out values of the

  CLI- based sessions. By default, up to five simultaneous, encrypted SSH connections for multiple CLI-based sessions over the network are available (session 0 to session 4). After the execution shell starts, the CLI-based session time-out

  value returns to the default of 10 minutes.

  Specify the number of times that a client can re-authenticate to the server. The default is 3; the range is 0 to 5.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/secur ity/configuration_guide/b_sec_3se_3850_cg/ b_sec_3se_3850_cg_chapter_01000.html

• Question 832:

  Which option describes the purpose of the leak-map keyword in the command eigrp stub connected leak-map EigrpLeak?

  A. It allows the specified static routes to be advertised.
  B. It allows exceptions to the route summarization that is configured.
  C. It allows specified EIGRP-learned routes to be advertised.
  D. It restricts specified connected routes from being advertised.
  C. It allows specified EIGRP-learned routes to be advertised.

  ---

  ExamplE. eigrp stub leak-map Command In the following example, the eigrp stub command is issued with the leak-map name keyword-argument pair to configure the device to reference a leak map that identifies routes to be advertised that would have been suppressed otherwisE. Device(config)# router eigrp 1 Device(config-router)# network 10.0.0.0 Device(config-router)# eigrp stub leak-map map1

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15- mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE- 48D8-8048- C971179E4E24

• Question 833:

  When is it useful to disable split horizon on an EIGRP interface?

  A. Disable it when you want to provide additional backup paths in your network.
  B. Disable it when you want to send routes that are learned from another routing protocol to peer on the same interface.
  C. Disable it when you need to send updates to peers on the interface on which the updates were received.
  D. It is never advisable to disable split horizon on an EIGRP interface.
  C. Disable it when you need to send updates to peers on the interface on which the updates were received.

• Question 834:

  Which technology can be affected when switches are used that do not support jumbo frames?

  A. 802.1x
  B. BFD
  C. OSPFv3
  D. 802.1q
  D. 802.1q

  ---

  The 802.1Q tag is 4 bytes. Therefore, the resulting Ethernet frame can be as large as 1522 bytes. If jumbo frames are not supported, then typically the MTU on an Ethernet link needs to be lowered to 1496 to support this extra 802.1Q tag.

• Question 835:

  When EIGRP is used as the IPv4 PE-CE protocol, which two requirements must be configured before the BGP IPv4 address family can be configured? (Choose two.)

  A. the route distinguisher
  B. the virtual routing and forwarding instance
  C. the loopback interface
  D. the router ID
  A. the route distinguisher
  B. the virtual routing and forwarding instance

  ---

  A VRF must be created, and a route distinguisher and route target must be configured in order for the PE routers in the BGP network to carry EIGRP routes to the EIGRP CE site. The VRF must also be associated with an interface in order for

  the PE router to send routing updates to the CE router.

  Prerequisites

  Before this feature can be configured, MPLS and CEF must be configured in the BGP network, and multiprotocol BGP and EIGRP must be configured on all PE routers that provide VPN services to CE routers.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/seipecec.html#wp1083316

• Question 836:

  Which protocol is the encapsulating protocol for mtrace packets?

  A. ICMP
  B. IGMP
  C. PIM
  D. GRE
  B. IGMP

  ---

  "mtrace" is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace

  towards the source.

  Reference:

  http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/ wwhelp.htm#context=NI_MCASTandfile=IP_Multicast.

  3.04.html

• Question 837:

  DRAG DROP

  Drag and drop the OSPF network type on the left to the correct category of timers on the right.

  Select and Place:

  

  

• Question 838:

  Which three options describe characteristics of a link state routing protocol? (Choose three)

  A. It uses cost in the metric calculation to determine the best path.
  B. It uses hop count in the metric calculation to determine the best path.
  C. It provides faster convergence as opposed to distance vector routing protocols.
  D. It is better in detecting suboptimal routing.
  E. It is topology driven and has an overall overview of the network.
  F. It only has a neighbor routing table.
  A. It uses cost in the metric calculation to determine the best path.
  C. It provides faster convergence as opposed to distance vector routing protocols.
  E. It is topology driven and has an overall overview of the network.

• Question 839:

  Which statement about traffic management when PIM snooping is enabled is true?

  A. Traffic is restricted to host ports.
  B. All multicast traffic is flooded to the designated router.
  C. Join message are flooded to all routers.
  D. Designated routers receive traffic only from groups through which a join message is received.
  D. Designated routers receive traffic only from groups through which a join message is received.

• Question 840:

  Refer to the exhibit.

  

  Which two statements about the device that generated the output are true? (Choose two.)

  A. The SPT-bit is set.
  B. The sparse-mode flag is set.
  C. The RP-bit is set.
  D. The source-specific host report was received.
  A. The SPT-bit is set.
  D. The source-specific host report was received.

  ---

  In this example we can see that the s, T, and I flags are set. Here is a list of the flags and their meanings:

  show ip mroute Field Descriptions

  Field

  Description

  Flags:

  Provides information about the entry.

  D - Dense

  Entry is operating in dense mode.

  S - Sparse

  Entry is operating in sparse mode.

  B - Bidir Group

  Indicates that a multicast group is operating in bidirectional mode.

  s - SSM Group

  Indicates that a multicast group is within the SSM range of IP addresses. This flag is reset if the SSM range changes.

  C - Connected

  A member of the multicast group is present on the directly connected interface.

  L - Local

  The router itself is a member of the multicast group.

  P - Pruned

  Route has been pruned. The Cisco IOS software keeps this information so that a downstream member can join the source.

  R - RP-bit set

  Indicates that the (S, G) entry is pointing toward the RP. This is typically prune state along the shared tree for a particular source.

  F - Register flag

  Indicates that the software is registering for a multicast source.

  T - SPT-bit set

  Indicates that packets have been received on the shortest path source tree.

  J - Join SPT

  For (*, G) entries, indicates that the rate of traffic flowing down the shared tree is exceeding the SPT-Threshold set for the group. (The default SPT-Threshold setting is 0 kbps.) When the J- Join shortest path tree (SPT) flag is set, the next (S,

  G) packet received down the shared tree triggers an (S, G) join in the direction of the source, thereby causing the router to join the source tree.

  For (S, G) entries, indicates that the entry was created because the SPT-Threshold for the group was exceeded. When the J- Join SPT flag is set for (S, G) entries, the router monitors the traffic rate on the source tree and attempts to switch

  back to the shared tree for this source if the traffic rate on the source tree falls below the SPT-Threshold of the group for more than 1 minute.

  M - MSDP created entry

  Indicates that a (*, G) entry was learned through a Multicast Source Discovery Protocol (MSDP) peer. This flag is only applicable for a rendezvous point (RP) running MSDP.

  X - Proxy Join Timer Running

  Indicates that the proxy join timer is running. This flag is only set for (S, G) entries of an RP or "turnaround" router. A "turnaround" router is located at the intersection of a shared path (*, G) tree and the shortest path from the source to the RP.

  A - Advertised via MSDP

  Indicates that an (S, G) entry was advertised through an MSDP peer. This flag is only applicable for an RP running MSDP.

  U - URD

  Indicates that a URD channel subscription report was received for the (S, G) entry.

  I - Received Source Specific Host Report

  Indicates that an (S, G) entry was created by an (S, G) report. This (S, G) report could have been created by IGMPv3, URD, or IGMP v3lite. This flag is only set on the designated router (DR).

  Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/12s_ssm.html