Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 181:

  DRAG DROP

  Drag and Drop Cisco PFR adjacency types.

  Select and Place:

  

  

• Question 182:

  Which two statements are true about IS-IS? (Choose two.)

  A. IS-IS DIS election is nondeterministic.
  B. IS-IS SPF calculation is performed in three phases.
  C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly.
  D. IS-IS can never be routed beyond the immediate next hop.
  C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly.
  D. IS-IS can never be routed beyond the immediate next hop.

  ---

  IS-IS runs directly over the data link alongside IP. On Ethernet, IS-IS packets are always 802.3 frames, with LSAPs 0xFEFE while IP packets are either Ethernet II frames or SNAP frames identified with the protocol number 0x800. OSPF runs

  over IP as protocol number 89.

  IS-IS runs directly over layer 2 and hence:

  -

  cannot support virtual links unless some explicit tunneling is implemented

  -

  packets are kept small so that they don't require hop-by-hop fragmentation

  -

  uses ATM/SNAP encapsulation on ATM but there are hacks to make it use VcMux encapsulation

  -

  some operating systems that support IP networking have been implemented to differentiate Layer 3 packets in kernel. Such Oss require a lot of kernel modifications to support IS-IS for IP routing.

  -

  can never be routed beyond the immediate next hop and hence shielded from IP spoofing and similar Denial of Service attacks.

  Reference: https://tools.ietf.org/html/draft-bhatia-manral-diff-isis-ospf-00

• Question 183:

  Which IP SLA operation type is enhanced by the use of the IP SLAs Responder?

  A. DNS
  B. HTTP
  C. ICMP Echo
  D. UDP Echo
  D. UDP Echo

  ---

  Figure 1. UDP Echo Operation

  

  Response time (round-trip time) is computed by measuring the time taken between sending a UDP echo request message from Device B to the destination device--Device A--and receiving a UDP echo reply from Device A. UDP echo accuracy is enhanced by using the IP SLAs Responder at Device A, the destination Cisco device. If the destination device is a Cisco device, then IP SLAs sends a UDP datagram to any port number that you specified. Using the IP SLAs Responder is optional for a UDP echo operation when using Cisco devices. The IP SLAs Responder cannot be configured on non-Cisco devices.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla- 15-mt-book/sla_udp_echo.html

• Question 184:

  Which statement about BGP and diverse path advertisement is true?

  A. The BGP best-path selection must be disabled.
  B. The BGP best-path selection algorithm has been changed to always ignore the IGP metric.
  C. The BGP best-path selection algorithm has been changed so that two BGP paths can be flagged as best in the BGP table.
  D. The BGP best-path selection algorithm has not been changed.
  E. The BGP best-path selection is disabled for BGP routes for which the feature is enabled.
  D. The BGP best-path selection algorithm has not been changed.

  ---

  The BGP Diverse Path Using a Diverse-Path Route Reflector feature allows BGP to distribute an alternative path other than the best path between BGP speakers when route reflectors are deployed. This additional path is added to the best-path, and the best path algorithm still remains unchanged.

• Question 185:

  DRAG DROP

  Drag each spanning-tree feature on the left to the matching statement on the right.

  Select and Place:

  

  

• Question 186:

  Refer to the exhibit.

  

  Which configuration reduces CPU utilization on R2 while still advertising the connected routes of R2 to R1?

  A. Configure eigrp stub connected on R2.
  B. Configure eigrp stub receive-only on R1.
  C. Configure eigrp stub static on R2.
  D. Configure eigrp stub summary on R1.
  A. Configure eigrp stub connected on R2.

• Question 187:

  Refer to the exhibit.

  

  Which statement about authentication on Router A is true?

  A. The router will attempt to authenticate users against TACACS+ only.
  B. The router will attempt to authenticate users against the local database only.
  C. The router will attempt to authenticate users against the local database first, and fall back to TACACS+ if the local database authentication fails.
  D. The router will authenticate users against the default database only.
  E. The router will attempt to authenticate users against TACACS+ first, and fall back to the local database if the TACACS+ authentication fails.
  E. The router will attempt to authenticate users against TACACS+ first, and fall back to the local database if the TACACS+ authentication fails.

• Question 188:

  DRAG DROP

  Drag and drop the SNMP element on the left to the corresponding definition on the right.

  Select and Place:

  

  

• Question 189:

  Refer to the exhibit.

  

  What does the return code 3 represent in this output?

  A. The mapping of the replying router for the FEC is different.
  B. The packet is label-switched at stack depth.
  C. The return code is reserved.
  D. The upstream index is unknown.
  E. The replying router was the proper egress for the FEC.
  E. The replying router was the proper egress for the FEC.

  ---

  Return Codes The Return Code is set to zero by the sender. The receiver can set it to one of the values listed below. The notation refers to the Return Subcode. This field is filled in with the stack-depth for those codes that specify that. For all other codes, the Return Subcode MUST be set to zero.

  Value Meaning

  0 No return code 1 Malformed echo request received 2 One or more of the TLVs was not understood 3 Replying router is an egress for the FEC at stack- depth 4 Replying router has no mapping for the FEC at stack- depth

  Reference: https://www.ietf.org/rfc/rfc4379.txt

• Question 190:

  Refer to the exhibit.

  

  Which BGP feature allows R1 to instruct R2 which prefixes it is allowed to advertise to R1?

  A. route refresh
  B. Prefix-Based Outbound Route Filtering
  C. distribute lists
  D. prefix lists
  B. Prefix-Based Outbound Route Filtering