Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 351:

  Which two statements are true about 6to4 tunnels? (Choose two.)

  A. In a 6to4 tunnel, the first two bytes of the IPv6 address will be 0x2002 and the next four bytes will be the hexadecimal equivalent of the IPv4 address.
  B. In a 6to4 tunnel, the first two bytes of the IPv6 address will be locally derived and the next two bytes will be the hexadecimal equivalent of the IPv4 address.
  C. In a 6to4 tunnel, the IPv4 address 192.168.99.1 would be converted to the 2002:c0a8:6301::/48 IPv6 address.
  D. In a 6to4 tunnel, the IPv4 address 192.168.99.1 would be converted to the 2002:c0a8:6301::/16 IPv6 address.
  E. In a 6to4 tunnel, the IPv4 address 192.168.99.1 would be converted to the 2002:1315:4463:1::/64 IPv6 address.
  A. In a 6to4 tunnel, the first two bytes of the IPv6 address will be 0x2002 and the next four bytes will be the hexadecimal equivalent of the IPv4 address.
  C. In a 6to4 tunnel, the IPv4 address 192.168.99.1 would be converted to the 2002:c0a8:6301::/48 IPv6 address.

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  In a 6to4 tunnel, the first two bytes of the IPv6 address will be 0x2002 and the next four bytes will be the hexadecimal equivalent of the IPv4 address. The IPv4 address 192.168.99.1 would be converted to the 2002:c0a8:6301::/48 IPv6 address.

• Question 352:

  Which two types of routes will be advertised with the EIGRP configuration as shown? (Choose two.)

  router eigrp 100 network 10.0.0.0 eigrp stub

  A. static
  B. receive-only
  C. summary
  D. stub
  E. connected
  F. dynamic
  C. summary
  E. connected

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  The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature improves network stability, reduces resource utilization, and simplifies stub router configuration.

  Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network, one or more end (stub) networks are connected to a remote router (the spoke) that is connected to one or more distribution routers (the hub). The remote router is adjacent only to one or more distribution routers. The only route for IP traffic to follow into the remote router is through a distribution router. This type of configuration is commonly used in WAN topologies where the distribution router is directly connected to a WAN. The distribution router can be connected to many more remote routers. Often, the distribution router will be connected to 100 or more remote routers. In a hub and spoke topology, the remote router must forward all nonlocal traffic to a distribution router, so it becomes unnecessary for the remote router to hold a complete routing table. Generally, the distribution router need not send anything more than a default route to the remote router. When using the EIGRP Stub Routing feature, you need to configure the distribution and remote routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are propagated from the remote (stub) router. The router responds to queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message "inaccessible." A router that is configured as a stub will send a special peer information packet to all neighboring routers to report its status as a stub router.

  Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes, and a router that has a stub peer will not query that peer. The stub router will depend on the distribution router to send the proper updates to all peers. Router(config- router)#eigrp stub [receive- only | connected| static | summary] :Configures a remote router as an EIGRP stub router.

• Question 353:

  Click and drag the command on the left to the associated task on the right.

  Select and Place:

  

  

• Question 354:

  You have been tasked with setting up OSPF on an existing company router usingIPv6. Which command enables OSPF for IPv6 on a router?

  A. ipv6 router ospf process-id
  B. router ospf process-id
  C. router ospf ipv6 process-id
  D. ipv6 ospf process-id area-id
  E. None of the above
  A. ipv6 router ospf process-id

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  To enable Open Shortest Path First (OSPF) for IPv6 router configuration mode, use the ipv6 router ospf command in global configuration mode.

  ipv6 router ospf process-id

  Syntax Description

  process- Internal identification. It is locally assigned and can be a positive id integer from 1 to 65535. The number used here is the number assigned administratively when enabling the OSPF for IPv6 routing process.

  Reference:

  http://www.cisco.com/en/US/products/ps6922/products_command_reference_chapter09186a 00801d6615.html#wp2027608

• Question 355:

  If a metric is not specified for routes that are redistributed into OSPF, the default metric that is assigned to the routes is 20, except for redistributed BGP routes. What is the metric that is assigned to redistributed BGP routes?

  B. 1
  C. 10
  D. 200
  B. 1

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  If a metric is not specified, OSPF puts a default value of 20 when redistributing routes from all protocols except Border Gateway Protocol (BGP) routes, which get a metric of 1.

  Reference:

  http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009487e.shtml#os pf

• Question 356:

  Click and drag the BGP attributes characterization on the left to the correct BGP attribute on the right.

  

  

• Question 357:

  A problem was reported that the 10.10.10.0 /24 prefix was not injected into the local BGP table on RouterA. The following information is available from RouterA.

  router bgp 65001 network 10.0.0.0 neighbor 172.16.1.1 remote-as 65002 no auto-summary

  show ip route

  o 10.10.10.0 /24 [110/11] via 192.168.1.1 2d00h, Ethernet0/0 Why is this prefix not in the local BGP table?

  A. This route is not a BGP learned route.
  B. The network command is wrong.
  C. The 172.16.1.1 neighbor is down.
  D. The prefix 10.10.10.0 /24 is not a 'connected' route.
  B. The network command is wrong.

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  Network command is wrong because to advertise any network through bgp, the prefix and network mask must be exact as per the IP routing table. So to advertise this ospf route of 10.10.10.0/24, the network command in bgp should be : network 10.10.10.0 mask 255.255.255.0

• Question 358:

  what is the best order for choosing the Router-ID in ospf?

  A. high loopbak interface address,high physical interface address, Router ID command
  B. high loopbak interface address, Router ID command, high physical interface address
  C. Router ID command, high loopbak interface address, high physical interface address ||
  D. Router ID command, high physical interface address, high loopbak interface address
  E. high physical interface address, high loopbak interface address, Router ID command
  F. high physical interface address, Router ID command, high loopbak interface address
  C. Router ID command, high loopbak interface address, high physical interface address ||

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  The Router ID (RID) is an IP address used to identify the router in the OSPF database (LSDB). Cisco chooses the Router ID by using the highest IP address of all configured loopback interfaces. If no loopback interfaces are configured with addresses, OSPF will choose the highest IP address of all active physical interfaces

• Question 359:

  Your network has a mixture of Fast Ethernet and Gigabit Ethernet links. What needs to be done to ensure optimal data routing when using OSPF?

  A. Nothing. OSPF will determine the most optimal path for routing data by default.
  B. Adjust the hello and dead timers for more rapid detection of link failures.
  C. Increase the reference-bandwidth used to calculate the interface default metrics, on all routers in your network.
  D. Set the priority values on every broadcast interface to ensure that the designated and backup designated routers are the routers with the most processor and memory resources.
  C. Increase the reference-bandwidth used to calculate the interface default metrics, on all routers in your network.

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  The default formula to calculate the cost for the OSPF metric is (108/BW). Therefore when using default reference bandwidth (100M) to calculate ospf, Gi and Fa interfaces could have the same cost (1). This problem can be fixed by configuring reference bandwidth to 1000M.

  

  This is how to configure reference bandwidth to 1000Mbps:

  Router(config)#router ospf 1 Router(config-router)#auto-cost reference-bandwidth 1000

• Question 360:

  Which DSL encapsulation method requires client software running on the end-user PC that is directly connected to a DSL modem?

  A. PPPoA
  B. PPPoE
  C. PPP
  D. L2TP
  E. ATM
  B. PPPoE

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  Reference: http://www.vicomsoft.com/learning-center/pppoe/