Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 361:

  Which two of these statements regarding RSTP are correct? (Choose two.)

  A. RSTP cannot operate with PVST+.
  B. RSTP defines new port roles.
  C. RSTP defines no new port states.
  D. RSTP is a proprietary implementation of IEEE 802.1D STP.
  E. RSTP is compatible with the original IEEE 802.1D STP.
  B. RSTP defines new port roles.
  E. RSTP is compatible with the original IEEE 802.1D STP.

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  When network topology changes, rapid spanning tree protocol (IEEE802.1W, referred to as RSTP) will speed up significantly the speed to re-calculate spanning tree. RSTP not only defines the role of other ports: alternative port and backup port, but also defines status of 3 ports: discarding status, learning status, forwarding status.

  RSTP is 802.1D standard evolution, not revolution. It retains most of the parameters, and makes no changes.

• Question 362:

  Which two benefits are provided by using a hierarchical addressing network addressing scheme? (Choose two.)

  A. reduces routing table entries
  B. auto-negotiation of media rates
  C. efficient utilization of MAC addresses
  D. dedicated communications between devices
  E. ease of management and troubleshooting
  A. reduces routing table entries
  E. ease of management and troubleshooting

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  Here are some of the benefits of hierarchical addressing:

  Reduced number of routing table entries -- whether it is with your Internet routers or your internal routers, you should try to keep your routing tables as small as possible by using route summarization. Route summarization is a way of

  

  having a single IP address represent a collection of IP addresses; this is most easily accomplished when you employ a hierarchical addressing plan. By summarizing routes, you can keep your routing table entries (on the routers that receive the summarized routes) manageable, which offers the following benefits:

  -More efficient routing

  - A reduced number of CPU cycles when recalculating a routing table or sorting through the routing table entries to find a match

  -Reduced router memory requirements

  - Reduced bandwidth required to send the fewer, smaller routing updates

  -Faster convergence after a change in the network

  -Easier troubleshooting

  -Increased network stability

  Efficient allocation of addresses -- Hierarchical addressing lets you take advantage of all possible addresses because you group them contiguously.

  

  Reference: http://www.ciscopress.com/articles/article.asp?p=174107

• Question 363:

  Which command can you enter to set the default route for all traffic to an interface?

  A. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1
  B. router(config)#ip route 0.0.0.0 255.255.255.255 GigabitEthernet0/1
  C. router(config-router)#default-information originate
  D. router(config-router)#default-information originate always
  A. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1

• Question 364:

  It has become necessary to configure an existing serial interface to accept a second Frame Relay virtual circuit. Which of the following procedures are required to accomplish this task? (Choose three.)

  A. Remove the IP address from the physical interface.
  B. Encapsulate the physical interface with multipoint PPP.
  C. Create the virtual interfaces with the interface command.
  D. Configure each subinterface with its own IP address.
  E. Disable split horizon to prevent routing loops between the subinterface networks.
  F. Configure static Frame Relay map entries for each subinterface network.
  A. Remove the IP address from the physical interface.
  C. Create the virtual interfaces with the interface command.
  D. Configure each subinterface with its own IP address.

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  For multiple PVC's on a single interface, you must use subinterfaces, with each subinterface configured for each PVC. Each subinterface will then have its own IP address, and no IP address will be assigned to the main interface.