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Home Cisco® 640-878

Cisco® 640-878 Exam Practice Questions (P. 5)

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Question #21
ISPs use which protocol to establish peering sessions in an Internet exchange point environment?
  1. A
    LDP
  2. B
    IS-IS
  3. C
    BGP
  4. D
    OSPF

Correct Answer:
C

Question #22
You are enabling OSPF on a router and notice that all the Fast Ethernet and the Gigabit Ethernet interfaces have the same OSPF cost of 1. Which single configuration change can you make in router ospf configuration mode so that the Fast Ethernet interfaces have a higher OSPF cost than the Gigabit Ethernet interfaces?
  1. A
    Change the OSPF interface cost globally.
  2. B
    Change the OSPF default metric.
  3. C
    Change the OSPF auto-cost reference bandwidth.
  4. D
    Change the OSPF administrative distance.
  5. E
    Change the OSPF metric type from E2 to E1.

Correct Answer:
C
http://ccietobe.blogspot.com/2008/06/ospf-auto-cost-reference-bandwidth_02.html

Question #23
On Cisco IOS XR software, which set of commands enables OSPF area 0 on the Gi0/0/0/0 interface that has an IPv4 IP address of 192.168.1.1/24?
  1. A
    router ospf 1network 192.168.1.1 0.0.0.0 area 0
  2. B
    router ospf 1network 192.168.1.1 255.255.255.255 area 0
  3. C
    router ospf 1area 0interface gi0/0/0/0
  4. D
    router ospfv3 1network 192.168.1.1 0.0.0.0 area 0
  5. E
    router ospfv3 1network 192.168.1.1 255.255.255.255 area 0
  6. F
    router ospfv3 1area 0network 192.168.1.0
  7. G
    router ospfv3 1area 0interface gi0/0/0/0

Correct Answer:
C

Question #24
Which three statements about OSPFv2 or OSPFv3 authentication are true? (Choose three.)
  1. A
    On Cisco IOS XR platforms, OSPFv3 authentication can be configured at the OSPF routing process, area, or interface level.
  2. B
    OSPF authentication on Cisco IOS and IOS XE platforms can be configured per area or per interface.
  3. C
    On Cisco IOS and IOS XE and IOS XR platforms, the authentication key can only be configured per interface.
  4. D
    OSPFv3 uses IPsec for authentication and encryption.
  5. E
    On Cisco IOS XR platforms, the OSPF authentication that is configured for the area overrides the authentication that is configured for the interface.
  6. F
    On Cisco IOS and IOS XE platforms, the two OSPFv2 authentication methods that are supported are MD5 and SHA1.

Correct Answer:
ABD
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37ospf.html

Question #25
Which statement is true about enabling IS-IS routing and using the net command to configure the NSAP address?
  1. A
    NSAP addresses have a fixed size of 20 bytes.
  2. B
    The NSEL must always be 00 to identify the router.
  3. C
    The area address follows the system ID field before the NSEL field.
  4. D
    An AFI of 39 indicates that the AFI is a locally administered private address.

Correct Answer:
B
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a00800a3e6f.shtml

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