Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 681:

  Refer to the exhibit.

  

  Which statement about the R3 network environment is true?

  A. 172.1.20.0/24 has an administrative distance of 20.
  B. RIP, OSPF and IS-IS are running.
  C. OSPF external routes are preferred over OSPF internal routes.
  D. The administrative distance for 172.16.X.X addresses is 110.
  C. OSPF external routes are preferred over OSPF internal routes.

• Question 682:

  Refer to the exhibit.

  

  What is a reason for the RIB-failure?

  A. CEF is not enabled on this router.
  B. The route 10.100.1.1/32 is in the routing table, but not as a BGP route.
  C. The routing table has yet to be updated with the BGP route.
  D. The BGP route is filtered inbound and hence is not installed in the routing table.
  B. The route 10.100.1.1/32 is in the routing table, but not as a BGP route.

  ---

  A rib-failure occurs when BGP tries to install the bestpath prefix into the RIB, but the RIB rejects the BGP route because a route with better administrative distance already exists in the routing table. An inactive Border Gateway Protocol (BGP)

  route is a route that is not installed in the RIB, but is installed in the BGP table as rib-failure.

  Example Topology

  Router 1 (R1) and router 2 (R2) have two parallel links; one links runs BGP AS 65535 and the other link runs Enhanced Interior Gateway Routing Protocol (EIGRP) AS 1. Both BGP and EIGRP are advertising the network 10.1.1.1/32 on R1.

  

  R2 learns about the 1.1.1.1/32 route through both EIGRP and BGP, but installs only the EIGRP route in the routing table because of the lower administrative distance. Since the BGP route is not installed in the R2 routing table, the route appears as a rib-failure in the R2 BGP table.

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol- bgp/116146-config-bgp-next-hop-00.html

• Question 683:

  Which feature can you implement to most effectively protect customer traffic in a rate- limited WAN Ethernet service?

  A. HCBWFQ
  B. IntServ with RSVP
  C. DiffServ
  D. The IPsec VTI qos pre-classify command
  E. Q-in-Q
  A. HCBWFQ

• Question 684:

  Which three statements about Cisco HDLC are true? (Choose three.)

  A. HDLC serial encapsulation provides asynchronous framing and error detection.
  B. Serial link keepalives are maintained by SLARP.
  C. HDLC serial encapsulation provides synchronous framing without retransmission.
  D. HDLC frame size can be reduced with MPPC compression.
  E. The interface is brought down after five ignored keepalives.
  F. The interface is brought down after three ignored keepalives.
  B. Serial link keepalives are maintained by SLARP.
  C. HDLC serial encapsulation provides synchronous framing without retransmission.
  F. The interface is brought down after three ignored keepalives.

  ---

  Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol

  (SLARP) to maintain serial link keepalives. For each encapsulation type, a certain number of keepalives ignored by a peer triggers the serial interface to transition to the down state. For HDLC encapsulation, three ignored keepalives causes

  the interface to be brought down. By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial encapsulation method, which provides the synchronous framing and error detection functions of HDLC without

  windowing or retransmission.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 819_SCG/6ser_conf.html#78662

• Question 685:

  Which three modes are valid PfR monitoring modes of operation? (Choose three.)

  A. route monitor mode (based on BGP route changes)
  B. RMON mode (based on RMONv1 and RMONv2 data)
  C. passive mode (based on NetFlow data)
  D. active mode (based on Cisco IP SLA probes)
  E. fast mode (based on Cisco IP SLA probes)
  F. passive mode (based on Cisco IP SLA probes)
  C. passive mode (based on NetFlow data)
  D. active mode (based on Cisco IP SLA probes)
  E. fast mode (based on Cisco IP SLA probes)

  ---

  Modes are: Mode monitor passive Passive monitoring is the act of PfR gathering information on user packets assembled into flows by Netflow. Passive monitoring is typically only recommended in Internet edge deployments because active probing is ineffective because of security policies that block probing. PfR, when enabled, automatically enables Netflow on the managed interfaces on the Border Routers. By aggregating this information on the Border Routers and periodically reporting the collected data to the Master Controller, the network prefixes and applications in use can automatically be learned. Mode monitor active Active monitoring is the act of generating Cisco IOS IP Service Level Agreements (SLAs) probes to generate test traffic for the purpose of obtaining information regarding the characteristics of the WAN links. PfR can either implicitly generates active probes when passive monitoring has identified destination hosts, or the network manager can explicitly configured probes in the PfR configuration. When jitter probes are used (common use case), Target Discovery is used to learn the respond address and to automatically generate the probes. Mode monitor Fast This mode generates active probes through all exists continuously at the configured probe frequency. This differs from either active or both modes in that these modes only generate probes through alternate paths (exits) in the event the current path is out-of-policy.

  Reference: http://docwiki.cisco.com/wiki/PfR:Technology_Overview#Mode_monitor_passive

• Question 686:

  Which two statements about IGPs are true? (Choose Two)

  A. RIPv2 and IS-IS calculate the metric of a link based on the bandwidth of a link.
  B. OSPF and IS-IS are classless protocols.
  C. OSPF and EIGRP have high resource usage.
  D. RiPv2 and EIGRP support VLSM.
  E. RIPv2 and OSPF are distance vector protocols.
  F. IS-IS and EIGRP are link-state protocols.
  B. OSPF and IS-IS are classless protocols.
  D. RiPv2 and EIGRP support VLSM.

• Question 687:

  Refer to the exhibit.

  

  For which reason could the statistics for IP SLA operation 1 be unknown?

  A. The ICMP echoes were lost in transit
  B. Data verification has been disabled
  C. The Type of Service parameter is configured incorrectly.
  D. The Operation Frequency value is the same as the Operation Timeout value.
  E. The IP SLA schedule is missing.
  E. The IP SLA schedule is missing.

• Question 688:

  Refer to the exhibit.

  

  Which statement is true?

  A. The Cisco PfR state is UP; however, the external interface Et0/1 of border router 10.1.1.1 has exceeded the maximum available bandwidth threshold.
  B. The Cisco PfR state is UP; however, an issue is preventing the border router from establishing a TCP session to the master controller.
  C. The Cisco PfR state is UP and is able to monitor traffic flows; however, MD5 authentication has not been successful between the master controller and the border routers.
  D. The Cisco PfR State is UP; however, the receive capacity was not configured for inbound traffic.
  E. The Cisco PfR state is UP, and the link utilization out-of-policy threshold is set to 90 percent for traffic exiting the external links.
  E. The Cisco PfR state is UP, and the link utilization out-of-policy threshold is set to 90 percent for traffic exiting the external links.

  ---

  All three interfaces show as UP, and the capacity is set to 500 kbps, with the max threshold set to 450 kbps (90% of 500kbps).

• Question 689:

  Refer to the exhibit.

  

  What will be the IP MTU of tunnel 0?

  A. 1500
  B. 1524
  C. 1476
  D. 1452
  E. 1548
  C. 1476

  ---

  In the case of the GRE tunnel interface, the IP maximum transmission unit (MTU) is 24 bytes less than the IP MTU of the real outgoing interface. For an Ethernet outgoing interface that means the IP MTU on the tunnel interface would be 1500 minus 24, or 1476 bytes.

  Reference: A spoke site that is connected to Router-A cannot reach a spoke site that is connected to Router-B, but both spoke sites can reach the hub. What is the likely cause of this issue http://www.cisco.com/c/en/us/support/docs/ip/ generic-routing-encapsulation- gre/13725-56.html

• Question 690:

  What is the preferred method to improve neighbor loss detection in EIGRP?

  A. EIGRP natively detects neighbor down immediately, and no additional feature or configuration is required.
  B. BFD should be used on interfaces that support it for rapid neighbor loss detection.
  C. Fast hellos (subsecond) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.
  D. Fast hellos (one-second hellos) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.
  B. BFD should be used on interfaces that support it for rapid neighbor loss detection.

  ---

  Bi-directional Forwarding Detection (BFD) provides rapid failure detection times between forwarding engines, while maintaining low overhead. It also provides a single, standardized method of link/device/protocol failure detection at any protocol layer and over any media. Reference: "Bidirectional Forwarding Detection for EIGRP"

  http://www.cisco.com/en/US/technologies/tk648/tk365/tk207/technologies_white_paper090 0aecd80243fe7.html