[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 11-20

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

Question No: 11 – (Topic 1)

What are two common TCP applications? (Choose two.)

  1. TFTP

  2. SMTP

  3. SNMP

  4. FTP

  5. DNS

Answer: B,D Explanation:

SMTP uses TCP port 25, while FTP uses TCP ports 20 and 21.

Reference: http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/

Question No: 12 – (Topic 1)

Refer to the exhibit.

image

Which option describes how SwitchA will handle the frame just received?

  1. It will drop the frame.

  2. It will forward the frame out of port Fa0/3 only.

  3. It will flood the frame out all ports.

  4. It will flood the frame out of all the ports except Fa0/3.

Answer: D

Question No: 13 – (Topic 1)

Which layer of the TCP/IP stack combines the OSI model physical and data link layers?

  1. Internet layer

  2. transport layer

  3. application layer

  4. network access layer

Answer: D Explanation:

The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication over the

internet. The TCP/ IP model was created after the OSI 7 layer model for two major reasons. First, the foundation of the Internet was built using the TCP/IP suite and through the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the Department of Defense (DOD) consisted of creating the TCP/IP protocols. The DOD#39;s goal was to bring international standards which could not be met by the OSI model.

Since the DOD was the largest software consumer and they preferred the TCP/IP suite, most vendors used this model rather than the OSI. Below is a side by side comparison of the TCP/IP and OSI models.

image

Question No: 14 – (Topic 1)

Refer to the exhibit.

image

A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which network device and interface configuration meets the minimum requirements for this installation?

  1. a router with two Ethernet interfaces

  2. a switch with two Ethernet interfaces

  3. a router with one Ethernet and one serial interface

  4. a switch with one Ethernet and one serial interface

  5. a router with one Ethernet and one modem interface

Answer: C Explanation:

Only a router can terminate a leased line attachment access circuit, and only a router can connect two different IP networks. Here, we will need a router with two interfaces, one serial connection for the line attachment and one Ethernet interface to connect to the switch on the LAN.

Question No: 15 – (Topic 1)

Which two statements describe the operation of the CSMA/CD access method? (Choose two.)

  1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.

  2. In a CSMA/CD collision domain, stations must wait until the media is not in use before

    transmitting.

  3. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.

  4. After a collision, the station that detected the collision has first priority to resend the lost data.

  5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

  6. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.

Answer: B,E Explanation:

Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium. CSMA/CD was created to overcome the problem of those collisions that occur when packets are transmitted simultaneously from different nodes. And trust me, good collision management is crucial, because when a node transmits in a CSMA/CD network, all the other nodes on the network receive and examine that transmission. Only bridges and routers can effectively prevent a transmission from propagating throughout the entire network! So, how does the CSMA/CD protocol work?

Like this: when a host wants to transmit over the network, it first checks for the presence of a digital signal on the wire. If all is clear (no other host is transmitting), the host will then proceed with its transmission. But it doesn’t stop there. The transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If the host detects another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop sending data (think, busy signal). The nodes respond to that jam signal by waiting a while before attempting to transmit again. Backoff algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes attempting to transmit will then time out.

Question No: 16 – (Topic 1)

Refer to the exhibit.

image

SwitchA receives the frame with the addressing shown in the exhibit. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

  1. It will drop the frame.

  2. It will forward the frame out port Fa0/6 only.

  3. It will forward the frame out port Fa0/3 only.

  4. It will flood the frame out all ports.

  5. It will flood the frame out all ports except Fa0/3.

Answer: E Explanation:

When frame receives the frame, it checks the source address on MAC table if MAC address found in MAC table it tries to forward if not in MAC table adds the Address on MAC table. After checking the source address, it checks the destination address on MAC table, if MAC address found on MAC table it forwards to proper ports otherwise floods on all ports except the source port.

Question No: 17 – (Topic 1)

Refer to the exhibit.

image

If the hubs in the graphic were replaced by switches, what would be virtually eliminated?

  1. broadcast domains

  2. repeater domains

  3. Ethernet collisions

  4. signal amplification

  5. Ethernet broadcasts

Answer: C Explanation:

Modern wired networks use a network switch to eliminate collisions. By connecting each device directly to a port on the switch, either each port on a switch becomes its own collision domain (in the case of half duplex links) or the possibility of collisions is eliminated entirely in the case of full duplex links.

Question No: 18 – (Topic 1)

What must occur before a workstation can exchange HTTP packets with a web server?

  1. A UDP connection must be established between the workstation and its default

    gateway.

  2. A UDP connection must be established between the workstation and the web server.

  3. A TCP connection must be established between the workstation and its default gateway.

  4. A TCP connection must be established between the workstation and the web server.

  5. An ICMP connection must be established between the workstation and its default gateway.

  6. An ICMP connection must be established between the workstation and the web server.

Answer: D Explanation:

HTTP uses TCP port 80, and a TCP port 80 connection must be established for HTTP communication to occur.

http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/

Question No: 19 – (Topic 1)

Refer to the exhibit.

image

Host A is sending a packet to Host B for the first time. What destination MAC address will Host A use in the ARP request?

A. 192.168.0.1

B. 172.16.0.50

C. 00-17-94-61-18-b0

D. 00-19-d3-2d-c3-b2

E. ff-ff-ff-ff-ff-ff

F. 255.255.255.255

Answer: E Explanation:

For the initial communication, Host A will send a broadcast ARP (all F#39;s) to determine the correct address to use to reach the destination.

ARP sends an Ethernet frame called an ARP request to every host on the shared link-layer legmen. The Ethernet header includes the source host MAC address and a destination address of all Fs representing a broadcast frame. The ARP request contains the sender#39;s MAC and IP address and the target (destination) IP address. The target#39;s MAC address is set to all 0s.

ARP Request

Reference: http://www.technicalhowto.com/protocols/arp/arp.html

Question No: 20 – (Topic 1)

Which network device functions only at Layer 1 of the OSI model?

image

  1. Option A

  2. Option B

  3. Option C

  4. Option D

  5. Option E

Answer: B Explanation:

Most hubs are amplifying the electrical signal; therefore, they are really repeaters with

several ports. Hubs and repeaters are Layer 1 (physical layer) devices.

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