Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 251:

  Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)

  A. the forwarding information base
  B. the label forwarding information base
  C. the IP routing table
  D. the label information table
  E. the adjacency table
  A. the forwarding information base
  B. the label forwarding information base

  ---

  The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames. The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS.

• Question 252:

  Refer to the exhibit.

  

  Between which routers is an LDP session established?

  A. R1 and R3
  B. R1, R2 and R3
  C. R2 and R3
  D. R1 and R2
  D. R1 and R2

• Question 253:

  Which three components comprise the structure of a pseudowire FEC element? (Choose three.)

  A. pseudowire ID
  B. pseudowire type
  C. control word
  D. Layer 3 PDU
  E. header checksum
  F. type of service
  A. pseudowire ID
  B. pseudowire type
  C. control word

  ---

  The Pseudowire ID FEC element has the following components: Pseudowire ID FEC -- The first octet has a value of 128 that identifies it as a Pseudowire ID FEC element. Control Word Bit (C-Bit) -- The C-bit indicates whether the advertising PE expects the control word to be present for pseudowire packets. A control word is an optional 4-byte field located between the MPLS label stack and the Layer 2 payload in the pseudowire packet. The control word carries generic and Layer 2 payload-specific information. If the C-bit is set to 1, the advertising PE expects the control word to be present in every pseudowire packet on the pseudowire that is being signaled. If the C-bit is set to 0, no control word is expected to be present. Pseudowire Type -- PW Type is a 15-bit field that represents the type of pseudowire. Examples of pseudowire types are shown in Table 6-1. Pseudowire Information Length -- Pseudowire Information Length is the length of the Pseudowire ID field and the interface parameters in octets. When the length is set to 0, this FEC element stands for all pseudowires using the specified Group ID. The Pseudowire ID and Interface Parameters fields are not present. Group ID -- The Group ID field is a 32-bit arbitrary value that is assigned to a group of pseudowires. Pseudowire ID -- The Pseudowire ID, also known as VC ID, is a non-zero, 32-bit identifier that distinguishes one pseudowire from another. To connect two attachment circuits through a pseudowire, you need to associate each one with the same Pseudowire ID. Interface Parameters -- The variable-length Interface Parameters field provides attachment circuit-specific information, such as interface MTU, maximum number of concatenated ATM cells, interface description, and so on.

  Reference: http://www.ciscopress.com/articles/article.asp?p=386788andseqNum=2

• Question 254:

  DRAG DROP

  Drag and drop the BGP state on the left to the action that defines it on the right.

  Select and Place:

  

  

• Question 255:

  Refer to the exhibit.

  

  Which statement about the configuration is true?

  A. This configuration is incorrect because the dialer interface number must be the same as the dialer pool number.
  B. This configuration is missing an IP address on the dialer interface.
  C. This configuration is incorrect because the MTU must match the ppp-max-payload that is defined.
  D. This configuration represents a complete PPPoE client configuration on an Ethernet connection.
  D. This configuration represents a complete PPPoE client configuration on an Ethernet connection.

• Question 256:

  Which two statements about Cisco IOS XE are true? (Choose two)

  A. Separate images are required for platform-dependent code.
  B. Its functions run as multiple separate processes in the OS.
  C. It uses a service blade outside Cisco IOS XE to integrate and run applications.
  D. It is deployed in a Linux-based environment.
  E. The FED feature provides separation between the control plane and the data plane.
  B. Its functions run as multiple separate processes in the OS.
  D. It is deployed in a Linux-based environment.

• Question 257:

  Which technology is not necessary to set up a basic MPLS domain?

  A. IP addressing
  B. an IGP
  C. LDP or TDP
  D. CEF
  E. a VRF
  E. a VRF

  ---

  The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS.

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

• Question 258:

  Which information does RA guard use to determine if an RA is allowed?

  A. a trusted binding-table database generated from RS messages.
  B. information output from IPv6 snooping.
  C. a trusted binding-table database generated from ND messages.
  D. manually configured trust sources.
  D. manually configured trust sources.

• Question 259:

  Which two statements about VRRP are true? (Choose two.)

  A. It is assigned multicast address 224.0.0.18.
  B. The TTL for VRRP packets must be 255.
  C. It is assigned multicast address 224.0.0.9.
  D. Its IP protocol number is 115.
  E. Three versions of the VRRP protocol have been defined.
  F. It supports both MD5 and SHA1 authentication.
  A. It is assigned multicast address 224.0.0.18.
  B. The TTL for VRRP packets must be 255.

• Question 260:

  DRAG DROP

  Drag and drop the BGP attribute on the left to the correct category on the right.

  Select and Place: