Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 71:

  Which two modes of operation does BFD support? (Choose two.)

  A. synchronous mode
  B. asynchronous mode
  C. demand mode
  D. echo mode
  E. aggressive mode
  F. passive mode
  B. asynchronous mode
  C. demand mode

  ---

  A session may operate in one of two modes: asynchronous mode and demand mode. In asynchronous mode, both endpoints periodically send Hello packets to each other. If a number of those packets are not received, the session is considered down. In demand mode, no Hello packets are exchanged after the session is established; it is assumed that the endpoints have another way to verify connectivity to each other, perhaps on the underlying physical layer. However, either host may still send Hello packets if needed.

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

• Question 72:

  Refer to the exhibit.

  

  Your organization has two offices, Site 1 and Site 2, which are connected by a provider backbone, as shown. Where must you configure an attachment circuit to allow the two sites to connect over a Layer 2 network using L2TPv3?

  A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0
  B. CE Site 1 Fa0/0 and CE Site 2 Fa0/0
  C. PE Site 1 Se0/0 and PE Site 2 Se0/0
  D. CE Site 1 Fa0/0 and PE Site 2 Se0/0
  A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0

• Question 73:

  Refer to the exhibit.

  

  Which statement is true?

  A. It is impossible for the destination interface to equal the source interface.
  B. NAT on a stick is performed on interface Et0/0.
  C. There is a potential routing loop.
  D. This output represents a UDP flow or a TCP flow.
  C. There is a potential routing loop.

  ---

  In this example we see that the source interface and destination interface are the same (Et0/0). Typically this is seen when there is a routing loop for the destination IP address.

• Question 74:

  Which two statements about BGP prefix-based outbound filtering are true? (Choose two.)

  A. It must be configured per address family.
  B. It can use prefix lists and route maps for filtering.
  C. It can be configured under the global BGP routing process.
  D. It can be configured for external peering sessions only.
  E. It can increase the processing load on the router.
  F. It supports IP multicast routes.
  A. It must be configured per address family.
  D. It can be configured for external peering sessions only.

• Question 75:

  Refer to the exhibit.

  

  Which statement is true?

  A. There is no issue with forwarding IPv6 traffic from this router.
  B. IPv6 traffic can be forwarded from this router, but only on Ethernet1/0.
  C. IPv6 unicast routing is not enabled on this router.
  D. Some IPv6 traffic will be blackholed from this router.
  D. Some IPv6 traffic will be blackholed from this router.

  ---

  Here we see that the IPV6 default route shows two different paths to take, one via Ethernet 1/0 and one via Ethernet 0/0. However, only Eth 1/0 shows a next hop IPV6 address (the link local IPV6 address). There is no link local next hop addressed known on Eth 0/0. Therefore, traffic to all destinations will be load balanced over the two paths, but only half of the IPv6 traffic will be sent to the correct upstream router.

• Question 76:

  How does EIGRP derive the metric for manual summary routes?

  A. It uses the best composite metric of any component route in the topology table.
  B. It uses the worst composite metric of any component route in the topology table.
  C. It uses the best metric vectors of all component routes in the topology table.
  D. It uses the worst metric vectors of all component routes in the topology table.
  A. It uses the best composite metric of any component route in the topology table.

  ---

  For example if your router has a routing table like this:

  D 192.168.8.0/24 [90/2632528] via 192.168.0.1, 00:00:12, Serial0/0 D 192.168.9.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0 D 192.168.10.0/24 [90/2195456] via 192.168.0.1, 00:00:12, Serial0/0 D 192.168.11.0/24 [90/2323456]

  via 192.168.0.1, 00:00:12, Serial0/0

  Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router):

  Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0

  After that the routing table of your router will look like this:

  D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0

  And we can see the manual summary route takes the smallest metric of the specific routes.

• Question 77:

  DRAG DROP

  Drag and drop each step of the Unicast RPF process on the left into the correct order on the right.

  Select and Place:

  

  

• Question 78:

  Which two configuration changes should be made on the OTP interface of an EIGRP OTP route reflector? (Choose two.)

  A. passive-interface
  B. no split-horizon
  C. no next-hop-self
  D. hello-interval 60, hold-time 180
  B. no split-horizon
  C. no next-hop-self

  ---

  The EIGRP Over the Top feature enables a single end-to-end Enhanced Interior Gateway Routing Protocol (EIGRP) routing domain that is transparent to the underlying public or private WAN transport that is used for connecting disparate EIGRP customer sites. When an enterprise extends its connectivity across multiple sites through a private or a public WAN connection, the service provider mandates that the enterprise use an additional routing protocol, typically the Border Gateway Protocol (BGP), over the WAN links to ensure end-to-end routing. The use of an additional protocol causes additional complexities for the enterprise, such as additional routing processes and sustained interaction between EIGRP and the routing protocol to ensure connectivity, for the enterprise. With the EIGRP Over the Top feature, routing is consolidated into a single protocol (EIGRP) across the WAN.

  Perform this task to configure a customer edge (CE) device in a network to function as an EIGRP Route Reflector:

  1.

  enable

  2.

  configure terminal

  3.

  router eigrp virtual-name

  4.

  address-family ipv4 unicast autonomous-system as-number

  5.

  af-interface interface-type interface-number

  6.

  no next-hop-self

  7.

  no split-horizon

  8.

  exit

  9.

  remote-neighbors source interface-type interface-number unicast-listen lisp-encap

  10.

  network ip-address

  11.

  end Note. Use no next-hop-self to instruct EIGRP to use the received next hop and not the local outbound interface address as the next hop to be advertised to neighboring devices. If no next-hop-self is not configured, the data traffic will flow through the EIGRP Route Reflector. Reference: http://www.cisco.com/c/en/us/td/ docs/ios-xml/ios/iproute_eigrp/configuration/xe- 3s/ire-xe-3s-book/ire-eigrp-over-the-top.html

• Question 79:

  Which option is the common primary use case for tools such as Puppet. Chef. Ansible, and Salt?

  A. network function visualization
  B. policy assurance
  C. Configuration management.
  D. network orchestration.
  C. Configuration management.

• Question 80:

  Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream receivers are sent on the multicast router-connected ports?

  A. IGMP snooping
  B. Router Guard
  C. PIM snooping
  D. multicast filtering
  C. PIM snooping

  ---

  Ideally, the Layer 2 device should forward the multicast transmission only out ports to which receivers are connected and also out any ports that are connected to downstream multicast routers. This configuration requires a Layer 2 device to be able to determine the ports on which multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two mechanisms: IGMP snooping -- The switch listens in or "snoops" IGMP communications between receivers and multicast routers. This snooping enables the switch to determine which ports are connected to receivers for each multicast group and which ports are connected to multicast routers. Cisco Group Management Protocol (CGMP) -- The switch communicates with multicasts routers, with multicast routers relaying group membership information to switches.

  Reference: https://www.informit.com/library/content.aspx?b=CCNP_Studies_SwitchingandseqNum=59