[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 31-40

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Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

Question No: 31 – (Topic 1)

Which OSI layer header contains the address of a destination host that is on another network?

  1. application

  2. session

  3. transport

  4. network

  5. data link

  6. physical

Answer: D Explanation:

Only network address contains this information. To transmit the packets the sender uses network address and datalink address. But the layer 2 address represents just the address of the next hop device on the way to the sender. It is changed on each hop. Network address remains the same.

image

Question No: 32 – (Topic 1)

Refer to the exhibit.

image

If host A sends an IP packet to host B, what will the source physical address be in the frame when it reaches host B?

A. 10.168.10.99

B. 10.168.11.88

C. A1:A1:A1:A1:A1:A1

D. B2:B2:B2:B2:B2:B2

E. C3:C3:C3:C3:C3:C3

F. D4:D4:D4:D4:D4:D4

Answer: E Explanation:

When packets transfer from one host to another across a routed segment, the source IP address always remains the same source IP address, and the source physical (MAC) address will be the existing router’s interface address. Similarly, the destination IP address always remains the same and the destination physical (MAC) address is the destination router’s interface address.

Question No: 33 – (Topic 1)

Which two characteristics apply to Layer 2 switches? (Choose two.)

  1. Increases the number of collision domains

  2. Decreases the number of collision domains

  3. Implements VLAN

  4. Decreases the number of broadcast domains

  5. Uses the IP address to make decisions for forwarding data packets

Answer: A,C Explanation:

Layer 2 switches offer a number of benefits to hubs, such as the use of VLANs and each switch port is in its own separate collision domain, thus eliminating collisions on the segment.

Question No: 34 – (Topic 1)

To what type of port would a cable with a DB-60 connector attach?

  1. Serial port

  2. Console port

  3. Ethernet port

  4. Fibre optic port

Answer: A Explanation:

Serial Connection

image

cl_3_dte_male

image

cl_2_dce

The picture on the left shows a V.35 DTE cable with a male DB60 connector and a male standard 34-pin Winchester-type connector. The right picture shows a V.35 DCE serial cable with a male DB60 connector and a female 34-pin Winchester-type connector. As you probably guessed already, the male connector of the DTE cable is attached to the DCE cable#39;s female connector, this is depicted in the picture below. This is known as a back-to- back connection, and #39;simulates#39; a WAN link. In a real world setup, the DTE cable#39;s male connector typically connects to a port on a CSU/DSU provided by a service provider (i.e. telco), which in turn connects to a CSU/DSU at another location, thru a T1 link for example. The DB60 connector connects to a Serial interface on a router.

image

cl_4_malefemale

Reference: http://www.techexams.net/techlabs/ccna/lab_hardware.shtml

Question No: 35 – (Topic 1)

Refer to the exhibit.

image

HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point?

A. abcd.1123.0045

B. 192.168.7.17

C. aabb.5555.2222

D. 192.168.1.1

E. abcd.2246.0035

Answer: E Explanation:

For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto.

Question No: 36 – (Topic 1)

Refer to the topology and switching table shown in the graphic.

image

Host B sends a frame to Host C. What will the switch do with the frame?

  1. Drop the frame

  2. Send the frame out all ports except port 0/2

  3. Return the frame to Host B

  4. Send an ARP request for Host C

  5. Send an ICMP Host Unreachable message to Host B

  6. Record the destination MAC address in the switching table and send the frame directly to Host C

Answer: B

Question No: 37 – (Topic 1)

How does TCP differ from UDP? (Choose two.)

  1. TCP provides best effort delivery.

  2. TCP provides synchronized communication.

  3. TCP segments are essentially datagrams.

  4. TCP provides sequence numbering of packets.

  5. TCP uses broadcast delivery.

Answer: B,D Explanation:

Because TCP is a connection-oriented protocol responsible for ensuring the transfer of a datagram from the source to destination machine (end-to-end communications), TCP must receive communications messages from the destination machine to acknowledge receipt of the datagram. The term virtual circuit is usually used to refer to the handshaking that goes on between the two end machines, most of which are simple acknowledgment messages (either confirmation of receipt or a failure code) and datagram sequence numbers.

Rather than impose a state within the network to support the connection, TCP uses synchronized state between the two endpoints. This synchronized state is set up as part of an initial connection process, so TCP can be regarded as a connection-oriented protocol. Much of the protocol design is intended to ensure that each local state transition is communicated to, and acknowledged by, the remote party.

Reference: http://en.wikibooks.org/wiki/Communication_Networks/TCP_and_UDP_Protocols

Question No: 38 – (Topic 1)

Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.)

  1. There are no collisions in full-duplex mode.

  2. A dedicated switch port is required for each full-duplex node.

  3. Ethernet hub ports are preconfigured for full-duplex mode.

  4. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.

  5. The host network card and the switch port must be capable of operating in full-duplex mode.

Answer: A,B,E Explanation:

Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions. Half-duplex Ethernet-typically 10BaseT-is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps-at most.

Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex. And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don’t need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet.

Question No: 39 – (Topic 1)

Which of the following are types of flow control? (Choose three.)

  1. buffering

  2. cut-through

  3. windowing

  4. congestion avoidance

  5. load balancing

Answer: A,C,D Explanation:

During Transfer of data, a high speed computer is generating data traffic a lot faster than the network device can handle in transferring to destination, so single gateway or destination device cannot handle much amount of traffic that is called quot;Congestionquot;.

Buffering

The Technie is used to control the data transfer when we have congestion, when a network device receive a data it stores in memory section and then transfer to next destination this process called quot;Bufferingquot;.

Windowing Whereas Windowing is used for flow control by the Transport layer.

Say the sender device is sending segments and the receiver device can accommodate only a fixed number of segments before it can accept more, the two devices negotiate the window size during the connection setup.

This is done so that the sending device doesn#39;t overflow the receiving device#39;s buffer. Also the receiving device can send a single acknowledgement for the segments it has received instead of sending an acknowledgement after every segment received.

Also, this window size is dynamic meaning, the devices can negotiate and change the window size in the middle of a session. So if initially the window size is three and the receiving device thinks that it can accept more number of segments in its buffer it can negotiate with the sending device and it increases it to say 5 for example.

Windowing is used only by TCP since UDP doesn#39;t use or allow flow control. Reference: http://www.info-it.net/cisco/ccna/exam-tips/flow-control.php

Question No: 40 – (Topic 1)

Refer to the exhibit.

image

What kind of cable should be used to make each connection that is identified by the numbers shown?

  1. 1 – Ethernet Crossover cable

    2 – Ethernet straight-through cable 3 – Fiber Optic cable

    4 – Rollover cable

  2. 1 – Ethernet straight-through cable 2 – Ethernet straight-through cable

    1. – Serial cable

    2. – Rollover cable

  3. 1 – Ethernet rollover cable 2 – Ethernet crossover cable 3 – Serial cable

    4 – Null-modem cable

  4. 1 – Ethernet straight-through cable 2 – Ethernet Crossover cable

    1. – Serial cable

    2. – Rollover cable

  5. 1 – Ethernet straight-through cable 2 – Ethernet Crossover cable

  1. – Serial cable

  2. – Ethernet Straight-through cable

Answer: B Explanation:

When connecting a PC to a switch, a standard Ethernet straight through cable should be used. This same cable should also be used for switch to router connections. Generally speaking, crossover cables are only needed when connecting two like devices (PC-PC, switch-switch, router-router, etc).

Routers connect to frame relay and other WAN networks using serial cables. Rollover cables are special cables used for connecting to the console ports of Cisco devices.

Topic 2, LAN Switching Technologies

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