Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 331:

  Which step in the router boot process searches for an IOS image to load into the router?

  A. bootstrap
  B. POST
  C. mini-IOS
  D. ROMMON mode
  A. bootstrap

• Question 332:

  Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

  A. HDLC
  B. PPP
  C. X.25
  D. Frame Relay
  B. PPP

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  PPP: Provides router-to-router and host-to-network connections over synchronous and asynchronous circuits. PPP was designed to work with several network layer protocols, including IP. PPP also has built-in security mechanisms, such as Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).

• Question 333:

  Which command can you enter to display the hits counter for NAT traffic?

  A. show ip nat statistics
  B. debug ip nat
  C. show ip debug nat
  D. clear ip nat statistics
  A. show ip nat statistics

• Question 334:

  Which command can you enter to route all traffic that is destined for 192.168.0.0/20 to a specific interface?

  A. router(config)#ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1
  B. router(config)#ip route 0.0.0.0 255.255.255.0 GigabitEthernet0/1
  C. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1
  D. router(config)#ip route 192.168.0.0 255.255.255.0 GigabitEthernet0/1
  A. router(config)#ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1

• Question 335:

  What are two benefits of using a single OSPF area network design? (Choose two.)

  A. It is less CPU intensive for routers in the single area.
  B. It reduces the types of LSAs that are generated.
  C. It removes the need for virtual links.
  D. It increases LSA response times.
  E. It reduces the number of required OSPF neighbor adjacencies.
  B. It reduces the types of LSAs that are generated.
  C. It removes the need for virtual links.

  ---

  OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows:

  LSA Type 1: Router LSA

  

  LSA Type 2: Network LSA LSA Type 3: Summary LSA

  

  

  LSA Type 4: Summary ASBR LSA

  

  LSA Type 5: Autonomous system external LSA

  

  LSA Type 6: Multicast OSPF LSA

  

  LSA Type 7: Not-so-stubby area LSA

  

  LSA Type 8: External attribute LSA for BGP

  

  If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router.

  All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non- backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non-backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed.

• Question 336:

  Which IPv6 address is valid?

  A. 2001:0db8:0000:130F:0000:0000:08GC:140B
  B. 2001:0db8:0:130H::87C:140B
  C. 2031::130F::9C0:876A:130B
  D. 2031:0:130F::9C0:876A:130B
  D. 2031:0:130F::9C0:876A:130B

  ---

  An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The leading 0's in a group can be collapsed using ::, but this can only be done once in an IP address.

• Question 337:

  Which two statistics appear in show frame-relay map output? (Choose two.)

  A. the number of BECN packets that are received by the router
  B. the value of the local DLCI
  C. the number of FECN packets that are received by the router
  D. the status of the PVC that is configured on the router E. the IP address of the local router
  B. the value of the local DLCI
  D. the status of the PVC that is configured on the router E. the IP address of the local router

  ---

  Sample "show frame-relay map" output:

  R1#sh frame map

  Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic,

  broadcast,, status defined, active

  Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic,

  broadcast,, status defined, active

  Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static,

  CISCO, status defined, active

• Question 338:

  Which two features can dynamically assign IPv6 addresses? (Choose two.)

  A. IPv6 stateless autoconfiguration
  B. DHCP
  C. NHRP
  D. IPv6 stateful autoconfiguration
  E. ISATAP tunneling
  A. IPv6 stateless autoconfiguration
  B. DHCP

• Question 339:

  What is the purpose of Inverse ARP?

  A. to map a known IP address to a MAC address
  B. to map a known DLCI to a MAC address
  C. to map a known MAC address to an IP address
  D. to map a known DLCI to an IP address
  E. to map a known IP address to a SPID
  F. to map a known SPID to a MAC address
  D. to map a known DLCI to an IP address

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  Dynamic address mapping relies on the Frame Relay Inverse Address Resolution Protocol (Inverse ARP), defined by RFC 1293, to resolve a next hop network protocol (IP) address to a local DLCI value. The Frame Relay router sends out Inverse ARP requests on its Frame Relay PVC to discover the protocol address of the remote device connected to the Frame Relay network. The responses to the Inverse ARP requests are used to populate an address-to-DLCI mapping table on the Frame Relay router or access server. The router builds and maintains this address-to-DLCI mapping table, which contains all resolved Inverse ARP requests, including both dynamic and static mapping entries.

• Question 340:

  Based on the network shown in the graphic Which option contains both the potential networking problem and the protocol or setting that should be used to prevent the problem?

  

  A. routing loops, hold down timers
  B. switching loops, split horizon
  C. routing loops, split horizon
  D. switching loops, VTP
  E. routing loops, STP
  F. switching loops, STP
  F. switching loops, STP

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  The Spanning-Tree Protocol (STP) prevents loops from being formed when switches or bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the 802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect loops, and then removes the loop by shutting down selected bridge interfaces. This algorithm guarantees that there is one and only one active path between two network devices.