Scaling Networks Version 6 – ScaN Final Exam

Scaling Networks (Version 6.00) – ScaN Final Exam

QUESTION 1

Which two parameters must match between neighboring OSPF routers in order to form an adjacency? (Choose two.)
router ID
IP address
process ID
cost
hello / dead timers*
network types*

To form a neighbor relationship between OSPF speaking routers, the routers should reside on the same network and have the same hello and dead intervals. Others criteria that must match are area ID and network type.

QUESTION 2
  1. Which command can be used to view the OSPF hello and dead time intervals?
  2. show ip protocols
    show ip ospf interface*
    show ip ospf neighbor
    show ip ospf route
  3. The OSPF hello and dead timers can be configured per interface. Hence, the correct command used to view the timers is the show ip ospf interface command. Adding the interface name and number to the command displays output for a specific interface.
QUESTION 3
  1. A network administrator is troubleshooting an OSPFv3 configuration on an IPv6 network. The administrator issues the show ipv6 protocols command. What is the purpose for this command?
    to verify that the router has formed an adjacency with its neighboring routers
    to display the OSPFv3 parameters configured on an interface
    to display the OSPFv3 learned routes in the routing table
    to verify OSPFv3 configuration information*
  2. There are various show commands to help troubleshoot or verify OSPFv3, including these:
    show ipv6 protocols – used to verify configuration information
    show ipv6 ospf neighbor – used to verify that the router has formed an adjacency with its neighboring routers
    show ipv6 ospf interface – used to display the OSPFv3 parameters configured on an interface
    show ipv6 route ospf – used to display only the OSPFv3 learned routes in the routing table
  3. QUESTION 4
  4. A network administrator has just changed the router ID on a router that is working in an OSPFv2 environment. What should the administrator do to reset the adjacencies and use the new router ID?
    Issue the clear ip ospf process privileged mode command.*
    Configure the network statements.
    Change the interface priority.
    Change the OSPFv2 process ID.
  5. QUESTION 5
  6. The graphic shows some partial output of the show ipv6 route command:R2# show ipv6 routeOE2 ::/0 [110/1]
    via FE80::200:CFF:FE3B:7501, GigabitEthernet0/0
    O 2001:DB8:CAFE:1::/64 [110/2]
    via FE80::200:CFF:FE3B:7501, GigabitEthernet0/0
    C 2001:DB8:CAFE:2::/64 [0/0]
    via GigabitEthernet0/1, directly connected
    L 2001:DB8:CAFE:2::1/128 [0/0]
    via GigabitEthernet0/1, receive
    O 2001:DB8:CAFE:3::/64 [110/2]
    via FE80::260:3EFF:FE02:EE01, GigabitEthernet0/0
    OI 2001:DB8:CAFE:4::/64 [110/3]
    via FE80::200:CFF:FE3B:7501, GigabitEthernet0/0
    C 2001:DB8:CAFE:A001::/64 [0/0]
    via GigabitEthernet0/0, directly connected
    L 2001:DB8:CAFE:A001::2/128 [0/0]
    via GigabitEthernet0/0, receive
    OI 2001:DB8:CAFE:B001::/64 [110/2]
    via FE80::200:CFF:FE3B:7501, GigabitEthernet0/0
    Refer to the exhibit. What two conclusions can be drawn based on the output of the show ipv6 route command? (Choose two.)
    Route 2001:DB8:CAFE:4::/64 is an external route advertised by an ASBR.
    R2 receives default route information from another router.*
    Route 2001:DB8:CAFE:B001::/64 is a route advertised by an ABR.*
    Routes 2001:DB8:CAFE:1::/64 and 2001:DB8:CAFE:3::/64 are advertised from the same router.
    Route 2001:DB8:CAFE:4::/64 is advertised by a router three hops away.The default route ::/0 is learned from another router (signified by OE2) with the link-local address of FE80::200:CFF:FE3B:7501. The symbol OI indicates that a route is learned from an ABR. Routes 2001:DB8:CAFE:1::/64 and 2001:DB8:CAFE:3::/64 are learned from different link-local addresses and therefore are not from the same router.

    QUESTION 6
  7. Refer to the exhibit. What three conclusions can be drawn from the displayed output? (Choose three.)

  8. The DR can be reached through the GigabitEthernet 0/0 interface.*
    There have been 9 seconds since the last hello packet sent.*
    This interface is using the default priority.
    The router ID values were not the criteria used to select the DR and the BDR.*
    The router ID on the DR router is 3.3.3.3
    The BDR has three neighbors.
  9. QUESTION 7
  10. A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected?
    The dead interval will now be 60 seconds.*
    The dead interval will now be 30 seconds.
    The dead interval will not change from the default value.
    The dead interval will now be 15 seconds.
QUESTION 8
  1. The graphic displays a switch that is connected to the FastEthernet 0/0 interfaces of three routers, R1, R2, and R3. R3 has also a FastEthernet 0/1 interface that is connected to another switch, which connects to the FastEthernet 0/0 interfaces of two more routers, R4 and R5.
    There are labels at one side of each router as follows:
    R1
    Router-ID: Not configured
    FastEthernet 0/0: 192.168.1.4
    FastEthernet 0/0 priority: 128
    Serial 0/0/0: 10.0.1.1
    Loopback 0: Not configured
    R2
    Router-ID: Not configured
    FastEthernet 0/0: 192.168.1.3
    FastEthernet 0/0 priority: default
    Serial 0/0/0: 10.0.2.1
    Loopback 0: 172.16.1.3R3
    Router-ID: 10.1.1.3
    FastEthernet 0/0: 192.168.1.5
    FastEthernet 0/0 priority: 1
    FastEthernet 0/1: 192.168.2.2
    FastEthernet 0/1 priority: 255
    Serial 0/0/0: 10.0.3.1
    Loopback 0: Not configuredR4
    Router-ID: 10.1.1.4
    FastEthernet 0/0: 192.168.2.3
    FastEthernet 0/0 priority: default
    Serial 0/0/0: 10.0.4.1
    Loopback 0: 172.16.1.4R5
    Router-ID: Not configured
    FastEthernet 0/0: 192.168.2.5
    FastEthernet 0/0 priority: 1
    Serial 0/0/0: 10.0.5.1
    Loopback 0: 172.16.1.5Refer to the exhibit. What are three resulting DR and BDR elections for the given topology? (Choose three.)


    R4 is BDR for segment B.
    R1 is DR for segment A.*
    R2 is BDR for segment A.*
    R3 is DR for segment A.
    R5 is BDR for segment B.*
    R3 is BDR for segment A.

    For segment A, R1 becomes DR because of the priority of 128 of the FastEthernet 0/0 interface. R2 becomes BDR because of the Loopback 0 interface IPv4 address.
    For segment B, R3 becomes DR because of the FastEthernet 0/0 interface priority of 255. R5 becomes BDR because of the IPv4 address on the Loopback 0 interface.

    QUESTION 9
  2. The exhibit displays some partial CLI output:

    FastEthernet0/0 is up, line protocol is up
    Internet Address 10.15.0.20/24, Area 0
    Process ID 1, Router ID 10.15.0.1, Network Type BROADCAST, Cost: 1
    Transmit Delay is 1 sec, State DR, Priority 1
    Designated Router (ID) 10.15.0.1, Interface address 10.15.0.20
    No backup designated router on this network
    Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:06
    Supports Link-local Signaling (LLS)
    Cisco NSF helper support enabled
    IETF NSF helper support enabled
    Index 3/3, flood queue length 0
    Next 0x0(0)/0x0(0)
    Last flood scan length is 0, maximum is 0
    Last flood scan time is 0 msec, maximum is 0 msec
    Refer to the exhibit. What the amount of time that has elapsed since the router received a hello packet?

  3. 40 seconds
    4 seconds*
    10 seconds
    6 seconds
    The show ip ospf interface command is used to display the OSPF parameters configured on an interface like the process ID; router ID; area, and so forth. In the exhibit the router has a default hello interval of 10 seconds. It also displays that the next hello is due in 6 seconds. Hence, the time elapsed is 4 seconds.
  4. QUESTION 10
  5. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
    A network administrator is configuring multiarea OSPFv3 on the routers. The routing design requires that the router RT1 is a DROTHER for the network in Area 0 and the DR for the network in Area 1. Check the settings and status of the routers. What can the administrator do to ensure that RT1 will meet the design requirement after all routers restart?

    Use the ipv6 ospf priority 0 command on the interface g0/0 of RT1.
    Use the ipv6 ospf priority 10 command on the interface g0/2 of RT1.*
    Configure the loopback 0 interface with 6.6.6.6.
    Restart all routers except for RT1.
    Change the router ID to 5.5.5.5 on RT1.
  6. In a multiarea OSPF network, if the interface priority is the same for all routers, then the router with highest router ID becomes the DR and the router with second highest router ID becomes BDR. Changing the router ID can influence the DR/BDR election. However, for an ABR, the same router ID will be used for DR/BDR elections for multiple areas. In this case, it is better to use the interface priority value to manage the DR/BDR election for different areas, because this value is interface specific.
  7. QUESTION 11
  8. The exhibit shows a topology that consists of two routers connected to each other via their respective serial 0/0/0 interfaces. The configuration of each router is as follows:R1:
    !
    *output omitted*
    !
    interface Serial0/0/0
    no ip address
    ipv6 address FE80::1 link-local
    ipv6 address 2001:DB8:ACAD::1/64
    ipv6 ospf 1 area 0
    clock rate 120000R2:
    !
    *output omitted*
    !
    interface Serial0/0/0
    no ip address
    ipv6 address 2001:DB8:ACAD::100/64
    ipv6 ospf 10 area 4
    Refer to the exhibit. A network administrator is configuring OSPF for R1 and R2, but the adjacency cannot be established. What is the cause of the issue?
    The interface s0/0/0 on router R2 is missing a link-local address.
    The process ID is misconfigured.
    The IP address on router R2 is misconfigured.
    The area ID is misconfigured.*To form a neighbor relationship between OSPF speaking routers, the routers should reside on the same network and have the same Hello and dead intervals. Others criteria that must match are area ID and network type. In the topology displayed, the two routers are in two different areas, thus causing an area mismatch error.

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