Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 211:

  Refer to the exhibit.

  

  Which prefixes will have their distance changed?

  A. all prefixes matching access-list 10 learned from peers in the range 10.1.12.0- 10.1.12.255
  B. all internal prefixes in the range 10.1.12.0-10.1.12.255 learned from peers matching access-list 10.
  C. all internal prefixes matching access-list 10 learned from peers in the range 10.1.12.0- 10.1.12.255
  D. all prefixes in the range 10.1.12.0-10.1.12.255 learned from peers matching access-list
  C. all internal prefixes matching access-list 10 learned from peers in the range 10.1.12.0- 10.1.12.255

• Question 212:

  Refer to the exhibit.

  

  R3 prefers the path through R1 to reach host 10.1.1.1.

  Which option describes the reason for this behavior?

  A. The OSPF reference bandwidth is too small to account for the higher speed links through R2.
  B. The default OSPF cost through R1 is less than the cost through R2.
  C. The default OSPF cost through R1 is more than the cost through R2.
  D. The link between R2 and R1 is congested.
  A. The OSPF reference bandwidth is too small to account for the higher speed links through R2.

  ---

  The default formula to calculate OSPF bandwidth is BW = Bandwidth Reference / interface bandwidth [bps] = 10^8 / / interface bandwidth [bps] BW of the R1-R3 link = 10^8 / 100Mbps = 10^8 / 10^8 = 1 BW of the R2-R3 link = 10^8 / 1Gbps =

  10^8 / 10^9 = 1 (round up) Therefore OSPF considers the two above links have the same Bandwidth -> R3 will go to 10.1.1.1 via the R1-R3 link. The solution here is to increase the Bandwidth Reference to a higher value using the "auto-cost

  reference-bandwidth" command under OSPF router mode. For example:

  Router(config)#router ospf 1

  Router(config-router)#auto-cost reference-bandwidth 10000 This will increase the reference bandwidth to 10000 Mbps which increases the BW of the R2-R3 link to 10^10 / 10^8 = 100.

• Question 213:

  Which technology can be used to prevent flooding of IPv6 multicast traffic on a switch?

  A. IGMP snooping
  B. IGMP filtering
  C. MLD snooping
  D. MLD filtering
  C. MLD snooping

  ---

  MLD snooping allows the switch to examine MLD packets and make forwarding decisions based on their content. You can configure the switch to use MLD snooping in subnets that receive MLD queries from either MLD or the MLD snooping querier. MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/snoopmld.html

• Question 214:

  Refer to the exhibit.

  

  Router A and router B are physically connected over an Ethernet interface, and IS-IS is configured as shown. Which option explains why the IS-IS neighborship is not getting formed between router A and router B?

  A. same area ID
  B. same N selector
  C. same domain ID
  D. same system ID
  D. same system ID

  ---

  With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique.

  The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing

  domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide.

  Reference:

  http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml

• Question 215:

  Which statement describes Cisco PfR link groups?

  A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers.
  B. Link groups define a strict or loose hop-by-hop path pReference:
  C. Link groups are required only when Cisco PfR is configured to load-balance all traffic.
  D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode.
  E. Link groups set a preference for primary and fallback (backup) external exit interfaces.
  E. Link groups set a preference for primary and fallback (backup) external exit interfaces.

  ---

  The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently

  selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance--using parameters such as reachability, delay, loss, jitter or MOS--on a path out of the specified link.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr- link-group.html

• Question 216:

  Which three responses can a remote RADIUS server return to a client? (Choose three.)

  A. Reject-Challenge
  B. Access-Reject
  C. Accept-Confirmed
  D. Access-Accept
  E. Access-Challenge F. Reject-Access
  B. Access-Reject
  D. Access-Accept
  E. Access-Challenge F. Reject-Access

• Question 217:

  In an MPLS VPN, which router attaches VPN labels to packets?

  A. PE
  B. C
  C. CE
  D. P
  A. PE

• Question 218:

  Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.)

  A. BGP
  B. EIGRP
  C. Static routing
  D. OSPF
  E. IS-IS
  D. OSPF
  E. IS-IS

  ---

  Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route--an exact matching route, or a less specific route--in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP- routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr- piro.html

• Question 219:

  Refer to the exhibit.

  

  Which action will solve the error state of this interface when connecting a host behind a Cisco IP phone?

  A. Configure dot1x-port control auto on this interface
  B. Enable errdisable recovery for security violation errors
  C. Enable port security on this interface
  D. Configure multidomain authentication on this interface
  D. Configure multidomain authentication on this interface

  ---

  In single-host mode, a security violation is triggered when more than one device are detected on the data vlan. In multidomain authentication mode, a security violation is triggered when more than one device are detected on the data or voice VLAN. Here we see that single host mode is being used, not multidomain mode.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12- 2/50sg/configuration/guide/Wrapper-46SG/dot1x.html#wp1309041

• Question 220:

  What are two reasons to use the ip ospf database filter all out command? (Choose two.)

  A. to maintain a centralized OSPF database on a single master device
  B. to avoid flooding LSAs on low-speed links
  C. to ensure a consistent OSPF database across the network
  D. to selectively filter OSPF routes without disrupting the SPF algorithm
  E. to filter only type 7 LSAs from an OSPF area
  F. to enable OSPF to send triggered updates
  A. to maintain a centralized OSPF database on a single master device
  B. to avoid flooding LSAs on low-speed links