Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 691:

  Refer to the exhibit.

  

  A spoke site that is connected to Router-A cannot reach a spoke site that is connected to Router-B, but both spoke sites can reach the hub. What is the likely cause of this issue?

  A. There is a router doing PAT at site B.
  B. There is a router doing PAT at site A.
  C. NHRP is learning the IP address of the remote spoke site as a /32 address rather than a /24 address.
  D. There is a routing issue, as NHRP registration is working.
  B. There is a router doing PAT at site A.

  ---

  If one spoke is behind one NAT device and another different spoke is behind another NAT device, and Peer Address Translation (PAT) is the type of NAT used on both NAT devices, then a session initiated between the two spokes cannot be

  established.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/sec_secure_connectivity/configuration/gui de/convert/sec_dmvpn_xe_3s_book/ sec_dmvpn_dt_spokes_b_nat_xe.html

• Question 692:

  Which command do you use to connect a dense-mode domain to a sparse-mode multicast domain?

  A. none, because there is no such command
  B. ip pim spt-threshold infinity
  C. ip pim register dense-mode
  D. ip pim dense-mode proxy-register
  D. ip pim dense-mode proxy-register

  ---

  For IP PIM multicast, Cisco recommends Sparse-Mode over Dense-Mode. In the midst of our network migration, we have a new network operating in Sparse- Mode with Anycast rendezvous point (RP) but our existing network is still operating in Dense-Mode. To bridge two different modes across both PIM domains, we should use the ip pim dense-mode proxy-register command on the interface leading toward the bordering dense mode region. This configuration will enable the border router to register traffic from the dense mode region (which has no concept of registration) with the RP in the sparse mode domain.

  Reference: http://networkerslog.blogspot.com/2010/12/bridging-dense-mode-pim-to- sparse-mode.html

• Question 693:

  Which two statements about LDP advertising when Explicit Null is in effect are true? (Choose two.)

  A. Penultimate hop popping is disabled.
  B. Penultimate hop popping is enabled.
  C. It is the default behavior for LDP.
  D. It is used for the advertisement of static routes.
  E. It is used for the advertisement of connected routes.
  A. Penultimate hop popping is disabled.
  E. It is used for the advertisement of connected routes.

• Question 694:

  Which two statements are true about an EVPL? (Choose two.)

  A. It has a high degree of transparency.
  B. It does not allow for service multiplexing.
  C. The EVPL service is also referred to as E-line.
  D. It is a point-to-point Ethernet connection between a pair of UNIs.
  C. The EVPL service is also referred to as E-line.
  D. It is a point-to-point Ethernet connection between a pair of UNIs.

  ---

  Following the MEF approach, the services that comprise the Metro Ethernet (ME) solution can be classified into the following two general categories:

  ?Point-to-point (PtP) -- A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs). ?Multipoint-to-multipoint (MPtMP) -- A single multipoint-to-multipoint Ethernet circuit provisioned between two or more

  UNIs. When there are only two UNIs in the circuit, more UNIs can be added to the same Ethernet virtual connection if required, which distinguishes this from the point-to-point type.

  In the MEF terminology, this maps to the following Ethernet service types:

  ?Ethernet Line Service Type (E-Line) -- Point-to-point Ethernet service ?Ethernet LAN Service Type (E-LAN) -- Multipoint-to-multipoint Ethernet service

  Reference:

  http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_C lusters/HA_ME3_6.pdf

• Question 695:

  Which timer expiration can lead to an EIGRP route becoming stuck in active?

  A. hello
  B. active
  C. query
  D. hold
  B. active

  ---

  As noted above, when a route goes into the active state, the router queries its neighbors to find a path to the pertinent network. At this point, the router starts a three minute active timer by which time it must receive replies from all queried neighbors. If a neighbor has feasible successors for the route, it will recalculate its own local distance to the network and report this back. However, if a neighbor does not have a feasible successor, it also goes into active state. In some cases, multiple routers along multiple query paths will go into active state as routers continue to query for the desired route. In most cases, this process will yield responses from all queried routers and the sought after route will transition back into the passive state within the three minute SIA query timer. In the case that none of the queried routers can provide a feasible successor, the route is cleared. In some cases, a response is not received between two neighbor routers because of link failures, congestion or some other adverse condition in either the network or on the queried router, and the three minute active timer expires on the router originating the query. When this happens, the querying router that did not receive a response logs a "DUAL-3-SIA" or "stuck-in-active" error for the route and then drops and restarts its adjacency with the non- responding router

  Reference: http://www.packetdesign.com/resources/technical-briefs/diagnosing-eigrp- stuck-active

• Question 696:

  Which two statements about Cisco Performance Routing are true? (Choose two.)

  A. It analyzes application performance to make routing decisions.
  B. When determining the best path, it prefers the shortest path.
  C. It can help the administrator determine the need for bandwidth upgrades.
  D. It operates entirely in the data plane.
  E. It can use EIGRP feasible successors to determine an alternate path.
  F. It analyzes system hardware performance to make routing decisions.
  A. It analyzes application performance to make routing decisions.
  E. It can use EIGRP feasible successors to determine an alternate path.

• Question 697:

  DRAG DROP

  What is the correct order of the VSS initialization process? Drag the actions on the left to the correct initialization step on the right.

  Select and Place:

  

  

• Question 698:

  Which statement describes the BGP add-path feature?

  A. It allows for installing multiple IBGP and EBGP routes in the routing table.
  B. It allows a network engineer to override the selected BGP path with an additional path created in the config.
  C. It allows BGP to provide backup paths to the routing table for quicker convergence.
  D. It allows multiple paths for the same prefix to be advertised.
  D. It allows multiple paths for the same prefix to be advertised.

  ---

  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.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe- 3s/irg-xe-3s-book/irg-additional-paths.html

• Question 699:

  Refer to the exhibit.

  

  R2 is mutually redistributing between EIGRP and BGP.

  Which configuration is necessary to enable R1 to see routes from R3?

  A. The R3 configuration must include ebgp-multihop to the neighbor statement for R2.
  B. The R2 BGP configuration must include bgp redistribute-internal.
  C. R1 must be configured with next-hop-self for the neighbor going to R2.
  D. The AS numbers configured on R1 and R2 must match.
  B. The R2 BGP configuration must include bgp redistribute-internal.

  ---

  Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode.

• Question 700:

  Which three statements are true about an EtherChannel? (Choose three.)

  A. PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.
  B. EtherChannel ports in suspended state can receive BPDUs but cannot send them.
  C. An EtherChannel forms between trunks that are using different native VLANs.
  D. LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both ends.
  E. Ports with different spanning-tree path costs can form an EtherChannel.
  A. PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.
  B. EtherChannel ports in suspended state can receive BPDUs but cannot send them.
  E. Ports with different spanning-tree path costs can form an EtherChannel.

  ---

  Answer A. EtherChannel groups running PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.

  Answer B:

  EtherChannel Member Port States

  Port States

  Description

  bundled

  The port is part of an EtherChannel and can send and receive BPDUs and data traffic.

  suspended

  The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data traffic is blocked.

  standalone

  The port is not bundled in an EtherChannel. The port functions as a standalone data port. The port can send and receive BPDUs and data traffic.

  Answer E. Ports with different spanning-tree path costs can form an EtherChannel if they are otherwise compatibly configured. Setting different spanning-tree path costs does not, by itself, make ports incompatible for the formation of an

  EtherChannel.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15- 0_2_EX/layer2/configuration_guide/b_lay2_152ex_2960-x_cg/ b_lay2_152ex_2960- x_cg_chapter_010.html