Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 331:

  Which three components are in an MPLS header? (choose three)

  A. a 4-bit experimental use field
  B. a 4-bit label stack entry
  C. an 8-bit TTL
  D. a 2-bottom of stack
  E. a 3-bit experimental use field
  F. a 20-bit label
  C. an 8-bit TTL
  E. a 3-bit experimental use field
  F. a 20-bit label

• Question 332:

  Refer to the exhibit.

  

  R1 and R2 both advertise 10.50.1.0/24 to R3 and R4 as shown. R1 is the primary path. Which path does traffic take from the R4 data center to the file server?

  A. All traffic travels from R4 to R2 to the file server.
  B. All traffic travels from R4 to R3 to R1 to the file server.
  C. Traffic is load-balanced from R4 to R2 and R3. Traffic that is directed to R3 then continues to R1 to the file server. Traffic that is directed to R2 continues to the file server.
  D. All traffic travels from R4 to R2 to R1 to the file server.
  A. All traffic travels from R4 to R2 to the file server.

• Question 333:

  Which option describes the purpose of the PPP endpoint discriminator?

  A. It identifies the maximum payload packet.
  B. It notifies the peer that it prefers 12-bit sequence numbers.
  C. It identifies the system attached to the link.
  D. It determines whether a loopback is on the link.
  C. It identifies the system attached to the link.

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  In situations in which many clients use the same username to initiate an MP connection, or when interoperating with non-Cisco routers, you need to control the order in which the bundle name is created. It is necessary to configure the access server to create a bundle name based on the endpoint discriminator first, the username second, or both. The endpoint discriminator identifies the system transmitting the packet and advises the network access server (NAS) that the peer on this link could be the same as the peer on another existing link. Because every client has a unique endpoint discriminator, only multiple links from the same client are bundled into a single unique MP connection. For example, consider when two PC clients initiate a multilink connection to an access server using the same username. If the multilink bundle name is established based on the endpoint discriminator first, then on the username or on both, the NAS can accurately bundle the links from each client using the endpoint discriminator as a bundle name. This bundle name is unique to the peer system transmitting the packet.

  Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol- ppp/10238-mppp-bundle-name.html

• Question 334:

  Which technology facilitates dynamic tunnel establishment in DMVPN?

  A. CEF
  B. mGRE
  C. a dynamic routing protocol
  D. NHRP
  D. NHRP

• Question 335:

  DRAG DROP

  Drag and drop the fragmentation characteristics on the left to the corresponding protocol on the right.

  Select and Place:

  

  

• Question 336:

  When do summary black holes occur in EIGRP?

  A. when the summary is removed due to the last component disappearing
  B. when a summary is created for security purposes to draw undesired traffic to a termination point
  C. when a summary is advertised that contains components that the advertising router cannot reach
  D. when components of the summary are present at multiple summary points
  C. when a summary is advertised that contains components that the advertising router cannot reach

• Question 337:

  Refer to the exhibit.

  

  Assume that Cisco Discovery Protocol is supported and enabled only on switches A and C.

  Which information is returned when you issue the command show cdp neighbors on switch C?

  A. a limited amount of information about switch B
  B. neighbor details for switch A
  C. neighbor details for switch B
  D. neighbor details for switch C
  B. neighbor details for switch A

• Question 338:

  Refer to the exhibit.

  

  Why is interface loopback 0 of R4 missing in the BGP table of R2?

  A. R2 is not configured as a route reflector client.
  B. The route is originating in the same cluster list.
  C. The route originated within the same AS.
  D. The next hop is not reachable form R2.
  A. R2 is not configured as a route reflector client.

• Question 339:

  Which TCP feature allows a client to request a specific packet that was lost?

  A. flow control
  B. sliding window
  C. fast recovery
  D. selective acknowledgment
  D. selective acknowledgment

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  TCP Selective Acknowledgment The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data. Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP sender could learn about only one lost packet per-round- trip time. An aggressive sender could choose to resend packets early, but such re-sent segments might have already been successfully received. The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host returns selective acknowledgment packets to the sender, informing the sender of data that has been received. In other words, the receiver can acknowledge packets received out of order. The sender can then resend only missing data segments (instead of everything since the first missing packet). Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would receive acknowledgment of only packets 1, 2, and 3. Packets 4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be re-sent. TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. There is no performance impact when the feature is enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP selective acknowledgment.

  Refer to RFC 2018 for more details about TCP selective acknowledgment.

• Question 340:

  Which statement about Type-4 LSA in OSPFv2 is true?

  A. It is present only in the backbone area.
  B. It is generated by each ABR and forwarded in non-stub areas.
  C. It is forwarded in NSSA areas.
  D. It is generated by the ASBR and forwarded throughout the whole OSPF domain.
  B. It is generated by each ABR and forwarded in non-stub areas.