CCNA Sample Questions

640-801

29. Please drag the appropriate options to the correct targets. After completing the question press the push button below the question to save your response.

    Answer: 1:E,2:A,3:F

    Explanation:
    LAPD - provides the data link protocol that allows delivery of messages across that D-channel to the local switch.
    LAPB - Protocol and is designed primarily to satisfy the signaling requirements of ISDN basic access. It is defined by ITU-T Recommendations Q.920 and Q.921.
    TE1 - ISDN -capable four-wire cable. Understands signaling and 2B=D. Uses an S reference point.
    ITU.T.430 - Defines connectors, encoding, framing, and reference points.
    TE2 - Equipment that does not understand ISDN protocols and specifications (no ISDN awareness).
    Uses an R reference point, typically an RS-232 or V.35 cable, to connect to a TA.
    NT1 - CPE equipment in North America. Connects with a U reference point (two-wire) to the telco.

30. Which routing protocol would allow a network administrator scalability, VLSM support and minimize overhead if the network administrator wants to merge different networks all using routers from multiple vendors?
    1. OSPF
    2. VTP
    3. EIGRP
    4. RIP
    5. IGRP

    Answer :A

31. You work as network administrator at Brain dump. Your trainee is configuring a router with both physical and logical interfaces. He asks you what factor determines the OSPF router ID. What should you tell him?
    1. The lowest IP address of any interface.
    2. The highest IP address of any interface.
    3. The highest IP address of any logical interface.
    4. The middle IP address of any logical interface.
    5. The lowest IP address of any physical interface.
    6. The highest IP address of any physical interface.
    7. The lowest IP address of any logical interface.

    Answer :F

    Explanation: The OSPF topology database includes information about routers and the subnets, or links, to which they are attached. To identify the routers in the neighbor table’s topology database, OSPF uses a router ID (RID) for each router. A router’s OSPF RID is that router’s highest IP address on a physical interface when OSPF starts running.

    Note: The OSPF router ID is a 32-bit IP address selected at the beginning of the OSPF process. Thehighest IP address configured on the router is the router ID. If a loopback address is configured, then it is the router ID. In case of multiple loopback addresses, the highest loopback address is the router ID. Once the router ID is elected it doesn't change unless the IP address is removed or OSPF restarts.

32. Which of the following routes will be used to forward data in a situation where a routing table contains static, RIP, and IGRP routes destined to the same network with each set to its default administrative distance?
    1. The IGRP route
    2. The static route
    3. The RIP route
    4. All three will load balance.

    Answer :B

    Explanation:To decide which route to use, IOS uses a concept called Administrative Distance. Administrative distance is a number that denotes how believable an entire routing protocol is on a single router. The lower the number, the better, or more believable the routing protocol.
    Route Type Administrative Distance

    • Static 1
    • IGRP 100
    • RIP 120
33. When you consider half-duplex and full-duplex Ethernet, what are unique for half-duplex Ethernet? (Select two options.)
    1. Half-duplex Ethernet operates in a shared collision domain.
    2. Half-duplex Ethernet operates in an exclusive broadcast domain.
    3. Half-duplex Ethernet has efficient throughput.
    4. Half-duplex Ethernet has lower effective throughput.
    5. Half-duplex Ethernet operates in an exclusive collision domain.

    Answer :A, D

    Explanation:A single device could not be sending a frame and receiving a frame at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame while receiving a frame. That logic is called half-duplex logic. Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

34. What Channel is provided by ISDN BRI?
    1. 2B+1D
    2. 30B+1D
    3. 23B+1D
    4. 2D+1B

    Answer :A

35. Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two)
    1. It is globally significant.
    2. It is an optional parameter required only if multiple OSPF processes are running on the router.
    3. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
    4. It is needed to identify a unique instance of an OSPF database.
    5. It is locally significant.

    Answer :D & E