Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 811:

  Which two statements about BGP loop prevention are true? (Choose two.)

  A. Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering.
  B. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.
  C. AS-override aids BGP loop prevention, but alternate loop prevention mechanisms are also necessary.
  D. Advertisements from the neighbors a BGP peering include a Site of Origin value that is separate from the configured value of the BGP peering.
  E. If the configured Site of Origin value of a BGP peering is greater than the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.
  F. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is permitted.
  A. Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering.
  B. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.

• Question 812:

  Which three statements are true about unicast RPF? (Choose three.)

  A. Unicast RPF requires CEF to be enabled.
  B. Unicast RPF strict mode works better with multihomed networks.
  C. Unicast RPF strict mode supports symmetric paths.
  D. Unicast RPF strict mode supports asymmetric paths.
  E. CEF is optional with Unicast RPF, but when CEF is enabled it provides better performance.
  F. Unicast RPF loose mode is typically used with ISP networks.
  A. Unicast RPF requires CEF to be enabled.
  C. Unicast RPF strict mode supports symmetric paths.
  F. Unicast RPF loose mode is typically used with ISP networks.

• Question 813:

  Refer to the exhibit.

  

  Which BGP feature is being used?

  A. fast session deactivation
  B. graceful restart
  C. PIC
  D. graceful shutdown
  A. fast session deactivation

• Question 814:

  In which two modes do IPv6-in-IPv4 tunnels operate? (Choose two.)

  A. tunnel mode
  B. transport mode
  C. 6to4 mode
  D. 4to6 mode
  E. ISATAP mode
  C. 6to4 mode
  E. ISATAP mode

  ---

  *There are 5 tunneling solution in IPv6:*

  *1. Using the "Tunnel mode ipv6ip", in this case the tunnel source and destination are configured with IPv4 addressing and the tunnel interface is configured with IPv6. This will use protocol 41. This is used for IPv6/IPv4. *

  R1(config)#int tunnel 1 R1(config-if)#ipv6 address 12:1:12::1/64 R1(config-if)#tunnel source 10.1.12.1 R1(config-if)#tunnel destination 10.1.12.2 R1(config-if)#*tunnel mode ipv6ip*

  *2. Using the "Tunnel mode gre ipv6, in this case the tunnel source and destination are all configured with IPv6 addressing. This is used for IPv6/IPv6. *

  BB1(config)#int tunnel 1 BB1(config-if)#ipv6 address 121:1:121::111/64 BB1(config-if)#tunnel source 10:1:111::111 BB1(config-if)#tunnel destination 10:1:112::112 BB1(config-if)#*tunnel mode gre ipv6*

  *3. In this case, the third type, the tunnel mode is NOT used at all, note that the tunnel interface is configured with IPv6 and the tunnel source and destination is configured with IPv4 but no mention of tunnel mode. This configuration will use protocol 47. This is used for IPv6/IPv4. *

  R1(config)#int tunnel 13 R1(config-if)#ipv6 address 13:1:13::1/64 R1(config-if)#tunnel source 10.1.13.1 R1(config-if)#tunnel destination 10.1.13.3 *4. Note in this case a special addressing is assigned to the tunnel interface which is a concatenation of a reserved IPv6 address of 2002followed by the translated IPv4 address of a given interface on the router. In this configuration ONLY the tunnel source address is used and since the tunnel is automatic, the destination address is NOT configured. The tunnel mode is set to "Tunnel mode ipv6ip 6to4. Note the IPv4 address of 10.1.1.1 is translated to 0A.01.01.01 and once concatenated, it will be "2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4. *

  R1(config)#interface Tunnel14 R1(config-if)#ipv6 address 2002:A01:101::/128 R1(config-if)#tunnel source 10.1.1.1 R1(config-if)#*tunnel mode ipv6ip 6to4*

  *5. ISATAP, ISATAP works like 6to4 tunnels, with one major difference, it uses a special IPv6 address which is formed as follows: * *In this tunnel mode, the network portion can be any IPv6 address, whereas in 6to4 it had to start with 2002.* *Note when the IPv6 address is assigned to the tunnel interface, the "eui-64 is used, in this case the host portion of the IPv6 address starts with "0000.5EFE" and then the rest of the host portion is the translated IPv4 address of the tunnel's source IPv4 address. This translation is performed automatically unlike 6to4. This is used for IPv6/IPv4.*

  R4(config)#int tunnel 46 R4(config-if)#ipv6 address 46:1:46::/64 eui-64 R4(config-if)#tunnel source 10.44.44.44 R4(config-if)#*tunnel mode ipv6ip ISATAP*

• Question 815:

  Refer to the exhibit.

  

  What will be the extended community value of this route?

  A. RT:200:3000 RT:200:9999
  B. RT:200:9999 RT:200:3000
  C. RT:200:3000
  D. RT:200:9999
  D. RT:200:9999

  ---

  Here the route map is being used to manually set the extended community RT to 200:9999

• Question 816:

  Which three benefits does the Cisco Easy Virtual Network provide to an enterprise network?

  (Choose three.)

  A. simplified Layer 3 network virtualization
  B. improved shared services support
  C. enhanced management, troubleshooting, and usability
  D. reduced configuration and deployment time for dot1q trunking
  E. increased network performance and throughput
  F. decreased BGP neighbor configurations
  A. simplified Layer 3 network virtualization
  B. improved shared services support
  C. enhanced management, troubleshooting, and usability

• Question 817:

  Which two 802.1D port states are expected in a stable Layer 2 network? (Choose two.)

  A. forwarding
  B. learning
  C. listening
  D. blocking
  E. disabled
  A. forwarding
  D. blocking

• Question 818:

  Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration?

  A. IS-IS does not protect from MTU mismatch.
  B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected.
  C. IS-IS uses path MTU discovery as specified in RFC 1063.
  D. IS-IS uses padding of hello packets to full MTU.
  D. IS-IS uses padding of hello packets to full MTU.

  ---

  Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system- to-intermediate-system-is-is/47201-isis-mtu.html

• Question 819:

  Refer to the exhibit.

  

  What is wrong with the configuration of this tunnel interface?

  A. ISATAP tunnels cannot use the EUI-64 address format.
  B. No tunnel destination has been specified.
  C. The tunnel source of an ISATAP tunnel must always point to a loopback interface.
  D. Router advertisements are disabled on this tunnel interface.
  D. Router advertisements are disabled on this tunnel interface.

  ---

  Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration:

  Example:

  Router(config-if)# no ipv6 nd ra suppress

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe- 3s/ir-xe-3s-book/ip6-isatap-xe.html

• Question 820:

  Which two options are contained in the MSG part of a syslog message? (Choose two.)

  A. TAG field
  B. CONTENT field
  C. three-digit priority value
  D. IP address of the sending device
  E. TLS port number
  A. TAG field
  B. CONTENT field