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CCNA 640-607 Practice Exam One.doc - Web Site Index of Pat Moss

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CCNA 640-607 Practice Exam One.doc - Web Site Index of Pat Moss ...

CCNA 640-607 Practice Exam One

     This exam (CCNA 640-607 Practice Exam One)and “Extra CCNA 640-607 Q and A” covers the types of questions that you are most likely to see on your CCNA 640-607 exam because they cover points that

    Cisco feels are important. You should read each question, answer, and explanation (if available) and then

    research the topic of the question more thoroughly to make sure you understand it completely. We highly

    recommend that you study exams Two, Three, Four, Five, and Six after studying this exam and “Extra CCNA 640-607 Q and A” because they should cover practically everything that you might find in a CCNA

    640-607 exam.

    Which command would you use to display traffic statistics on serial0?

A. display interface serial0

    B. show interface serial0

    C. show serial0 statistics

    D. show interface serial0 statistics

Answer: B

    Use the “Router#show interface serial0” command to display traffic statistics on serial0. The other commands are invalid. The following is an example. You will notice that this command will show broadcasts, incoming and outgoing packets, etc. on this interface if the interface is up (this one isn’t up, so nothing is going in or out):

2501#sh interface serial0

    Serial0 is down, line protocol is down

     Hardware is HD64570

     Internet address is 172.16.20.3/24

     MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255

     Encapsulation HDLC, loopback not set, keepalive set (10 sec)

     Last input never, output never, output hang never

     Last clearing of "show interface" counters never

     Input queue: 0/75/0 (size/max/drops); Total output drops: 0

     Queueing strategy: weighted fair

     Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations 0/0/256 (active/max active/max total)

     Reserved Conversations 0/0 (allocated/max allocated)

     5 minute input rate 0 bits/sec, 0 packets/sec

     5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

     DCD=down DSR=down DTR=down RTS=down CTS=down

2501#

What does the “Base” mean in 10BaseT?

A. Cable type

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CCNA 640-607 Practice Exam One

    B. Speed

    C. Spectrum used

    D. Signal type

Answer: D

    The “Base” in 10BaseT refers to the Baseband signaling method . Ethernet defined baseband technology, which means that when a station does transmit, it will use the entire bandwidth on the wire and will not share it.

Which statement regarding ISDN is true:

A. ISDN provides data only

    B. ISDN provides voice and data

    C. The standard defines hardware plus call setup schemes through end-

     to-end connectivity

    D. User receives more bandwidth with leased line of 56k than with

     multiple B channels

Answer: B

    ISDN (Integrated Services Digital Network) is a digital service designed to run over existing telephone networks. It can support voice, video, and data simultaneously. It has faster call setup than a modem and also has faster data rates than a modem connection.

    There are three switching modes: Cut-through, store-and-forward, and a modified version of cut-through. Regarding this modified version, which of the following is true?

A. Store-and-forward has a lower latency

    B. Cut-through has a higher latency

    C. It waits until 50% of the data in the packet has come into the switch

    before forwarding it

    D. It waits until the data portion of the packet reaches the switch

    before forwarding it

Answer: D

    The modified version of cut-through switching is called FragmentFree. It will wait until the first 64 bytes of the packet pass through the switch before forwarding it. The data portion of the packet begins after the 64 bytes. This switching method is the default for Cisco 1900 series switches. Store-and-forward has a higher latency than FragmentFree because it copies the whole frame onto its onboard buffers and then computes a cyclic redundancy check (CRC) before forwarding it. Cut-through has a lower latency because it only copies the destination address of the frame onto its onboard buffers before forwarding it. Which of the following commands would you use if you wanted to advertise the 199.42.78.0 network using the RIP protocol?

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CCNA 640-607 Practice Exam One

    A. RouterA(config)#router network 199.42.78.0

    B. RouterA(config)#rip network 199.42.78.0

    C. RouterA(config-router)#network 199.42.78.0

    D. RouterA(config-router)#rip network 199.42.78.0

Answer: C

    After you add the RIP routing protocol to the router using the “RouterA(config)#router rip” command, you are taken to router-config

    mode where you can choose to advertise the network 199.42.78.0 by using the command “RouterA(config-router)#network 199.42.78.0”.

How does the store-and-forward switching method work?

    A. Copies 50% of the frame onto its onboard buffers before forwarding

    the frame

    B. Discards frames if they are runts or giants

    C. Copies only the destination address in the frame before forwarding

    the frame

    D. Copies the first 64 bytes of the frame and checks it for

    fragmentation before forwarding the frame

Answer: B

    The store-and-forward switching method copies the whole frame onto its onboard buffers and computes a CRC (cyclic redundancy check) before forwarding the frame. Latency through the switch varies with the frame length. This switching method will discard frames if they are runts (less than 64 bytes including the CRC) or giants (more than 1518 bytes including the CRC). It is the mode used on the Cisco Catalyst 5000 switches and cannot be modified on the switch.

    Which WAN Link Data-Link protocols support multiple upper layer protocols? Choose two.

A. PPP

    B. LAPD

    C. ISDN

    D. HDLC

Answer: A and D

    While any two could really be chosen, PPP and HDLC are the best answers to this question.

    What are the three parts to a connection-oriented session?

A. call setup

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CCNA 640-607 Practice Exam One

    B. three-way handshake

    C. data transfer

    D. call termination

    E. DDR

Answer: A, C, and D

    A connection-oriented session requires a virtual circuit. The best answers would be call setup, data transfer, and call termination because a switched virtual circuit requires these. While a connection-oriented session is also called a “three-way handshake”, this question requires three answers.

What is backoff on an 802.3 network?

A. When two packets are sent and collide with each other

    B. The delay between a collision and when the station retransmits C. The connection between the NIC card and the hub

    D. Propagation of network congestion

Answer: B

    Backoff on an 802.3 network is the delay between a collision and when the station retransmits. If subsequent attempts also result in collisions, the station will retransmit up to 16 times before giving up.

    Which of the following two statements are true regarding RIP?

A. It is a link-state protocol

    B. It broadcasts its routing table every 30 seconds

    C.