Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 951:

  Which two statements about asymmetric routing are true? (Choose two)

  A. It can cause packet loss over stateful ICMP and UDP connections.
  B. It can cause packet loss when a stateful firewall is in use.
  C. It can cause TCP connections to close.
  D. It can cause packet loss when NAT is in use.
  E. It is uncommon in large networks.
  B. It can cause packet loss when a stateful firewall is in use.
  D. It can cause packet loss when NAT is in use.

• Question 952:

  Which two statements about the BGP community attribute are true? (Choose two.)

  A. Routers send the community attribute to all BGP neighbors automatically.
  B. A router can change a received community attribute before advertising it to peers.
  C. It is a well-known, discretionary BGP attribute.
  D. It is an optional transitive BGP attribute.
  E. A prefix can support only one community attribute.
  B. A router can change a received community attribute before advertising it to peers.
  D. It is an optional transitive BGP attribute.

  ---

  A community is a group of prefixes that share some common property and can be configured with the BGP community attribute. The BGP Community attribute is an optional transitive attribute of variable length. The attribute consists of a set of four octet values that specify a community. The community attribute values are encoded with an Autonomous System (AS) number in the first two octets, with the remaining two octets defined by the AS. A prefix can have more than one community attribute. A BGP speaker that sees multiple community attributes in a prefix can act based on one, some or all the attributes. A router has the option to add or modify a community attribute before the router passes the attribute on to other peers.

  Reference:

  http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28784-bgp- community.html

• Question 953:

  Which two options are interface requirements for turbo flooding? (Choose two.)

  A. The interface is Ethernet.
  B. The interface is configured for ARPA encapsulation.
  C. The interface is PPP.
  D. The interface is configured for GRE encapsulation.
  E. The interface is configured for 802.1Q encapsulation.
  A. The interface is Ethernet.
  B. The interface is configured for ARPA encapsulation.

  ---

  In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five

  times by using turbo- flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12- 2_50_se/configuration/guide/scg/swiprout.html

• Question 954:

  Which two statements about EIGRP load balancing are true? (Choose two.)

  A. EIGRP supports 6 unequal-cost paths.
  B. A path can be used for load balancing only if it is a feasible successor.
  C. EIGRP supports unequal-cost paths by default.
  D. Any path in the EIGRP topology table can be used for unequal-cost load balancing.
  E. Cisco Express Forwarding is required to load-balance across interfaces.
  A. EIGRP supports 6 unequal-cost paths.
  B. A path can be used for load balancing only if it is a feasible successor.

• Question 955:

  Refer to the exhibit.

  

  Which log levels are enabled for the console?

  A. informational only
  B. informational and debugging
  C. informational, debugging, notifications, warnings, errors, critical, alerts, and emergencies
  D. informational, notifications, warnings, errors, critical, alerts, and emergencies
  D. informational, notifications, warnings, errors, critical, alerts, and emergencies

• Question 956:

  Which two statements are true about a 6to4 tunnel connecting two IPv6 islands over the IPv4 Internet? (Choose two.)

  A. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 51.
  B. It works by appending the private IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix.
  C. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 41.
  D. It works by appending the public IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix.
  C. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 41.
  D. It works by appending the public IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix.

  ---

  6to4 embeds an IPv6 packet in the payload portion of an IPv4 packet with protocol type 41. To send an IPv6 packet over an IPv4 network to a 6to4 destination address, an IPv4 header with protocol type 41 is prepended to the IPv6 packet. The IPv4 destination address for the prepended packet header is derived from the IPv6 destination address of the inner packet (which is in the format of a 6to4 address), by extracting the 32 bits immediately following the IPv6 destination address's 2002::/16 prefix. The IPv4 source address in the prepended packet header is the IPv4 address of the host or router which is sending the packet over IPv4. The resulting IPv4 packet is then routed to its IPv4 destination address just like any other IPv4 packet.

  Reference: http://en.wikipedia.org/wiki/6to4

• Question 957:

  Which two statements about the MAC address table space are true? (Choose two.)

  A. You can disable learning on a VLAN to reduce table-space requirements.
  B. When you disable learning on a VLAN with an SVI, IP packet flooding in the Layer 2 domain is also disabled.
  C. Unicast, multicast, and broadcast MAC address filtering is configured globally and disabled by default.
  D. The default setting for static MAC addresses to age out of the MAC address table is 300 seconds.
  E. Turning off MAC learning on VLANs 900 through 1005 disables learning on VLANs 900 through 1001.
  A. You can disable learning on a VLAN to reduce table-space requirements.
  E. Turning off MAC learning on VLANs 900 through 1005 disables learning on VLANs 900 through 1001.

• Question 958:

  Which statement about a type 4 LSA in OSPF is true?

  A. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ASBR.
  B. It is an LSA that is originated by an ASBR, that is flooded throughout the AS, and that describes a route to the ASBR.
  C. It is an LSA that is originated by an ASBR, that is flooded throughout the area, and that describes a route to the ASBR.
  D. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ABR.
  E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR.
  E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR.

  ---

  LSA Type 4 (called Summary ASBR LSA) is generated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to external routes through that ASBR.

• Question 959:

  Refer to the exhibit.

  

  The spokes of the DMVPN with the given configuration are having QoS issues. Which two actions can you take to resolve the problem? (Choose two.)

  A. Configure qos pre-classify on the tunnel interface.
  B. Configure an NHRP group on the tunnel interface and associate it to a QoS policy.
  C. Modify the configuration of the IPsec policy to accept QoS policies.
  D. Manually configure a QoS policy on the serial interface.
  E. Configure the bandwidth statement on the tunnel interface.
  F. Configure the bandwidth statement on the serial interface.
  A. Configure qos pre-classify on the tunnel interface.
  B. Configure an NHRP group on the tunnel interface and associate it to a QoS policy.

  ---

  It is possible to classify based on information that is encrypted, which is needed in this example. You can use an access-list, configured to match the private subnet behind the remote spoke. The qos pre-classify command is used on the tunnel interface, and is required because the traffic is classified by a parameter that is encrypted as the traffic leaves the physical outbound interface. L4 information from the IP data packet can also classify traffic destined to the same private subnet. The " nhrp map group group-name service-policy output parent-policy-name" command adds the NHRP group to the QoS policy map on the hub.

• Question 960:

  Refer to the exhibit.

  

  While troubleshooting high CPU utilization of a Cisco Catalyst 4500 Series Switch, you notice the error message that is shown in the exhibit in the log file. What can be the cause of this issue, and how can it be prevented?

  A. The hardware routing table is full. Redistribute from BGP into IGP.
  B. The software routing table is full. Redistribute from BGP into IGP.
  C. The hardware routing table is full. Reduce the number of routes in the routing table.
  D. The software routing table is full. Reduce the number of routes in the routing table.
  C. The hardware routing table is full. Reduce the number of routes in the routing table.

  ---

  L3HWFORWADING-2

  Error MessageC4K_L3HWFORWARDING-2-FWDCAMFULL:L3 routing table is full.

  Switching to software forwarding.

  The hardware routing table is full; forwarding takes place in the software instead. The switch performance might be degraded. Recommended Action: Reduce the size of the routing table. Enter the ip cef command to return to hardware

  forwarding.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12- 2/31sg/system/message/message/emsg.html