Cisco: Transmission Control Protocol and Switch

Topics: Internet Protocol, Transmission Control Protocol, IP address Pages: 91 (15905 words) Published: March 9, 2015
Cisco.Actualtests.100-101.v2014-09-20.by.CODY.122q
Number: 100-101
Passing Score: 800
Time Limit: 120 min
File Version: 12.5

Exam Code: 100-101
Exam Name: CCNA Interconnecting Cisco Networking Devices 1 (ICND1)

Exam A
QUESTION 1
Which two statements describe the operation of the CSMA/CD access method? (Choose two) A.
B.
C.
D.
E.
F.

In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method. After a collision, the station that detected the collision has first priority to resend the lost data. 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. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.

Correct Answer: BE
Section: (none)
Explanation
Explanation/Reference:
Explanation
CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection. In an Ethernet LAN, before transmitting, a computer first listens to the network media. If the media is idle, the computer sends its data. If the media is not idle (another station is talking), the computer must wait for some time. When a station transmits, the signal is referred to as a carrier. Carrier Sense means that before a station can send data onto an Ethernet wire, it have to listen to see if another "carrier" (of another station) is present. If another station is talking, this station will wait until there is no carrier present. Multiple Access means that stations can access the network at any time. It is opposed to Token-Ring network where a station must have the "token" so that it can send data.

Although Carrier Sense help two stations not send data at the same time but sometimes two stations still send data at the same time! This is because two stations listen for network traffic, hear none, and transmit simultaneously -> a collision occurs and both stations must retransmit at some later time. Collision Detection is the ability of the media to detect collisions to know that they must retransmit. Basically, the CSMA/CD algorithm can be summarized as follows: + A device that wants to send a frame must wait until the LAN is silent (no one is "talking") + If a collision still occurs, the devices that caused the collision wait a random amount of time and then try to send data again.

Note: A switch separates each station into its own collision domain. It means that station can send data without worrying its data is collided with the data of other stations. It is as opposed to a hub which can cause collision between stations connected to it. QUESTION 2

On a live network, which commands will verify the operational status of router interfaces? (Choose two) A.
B.
C.
D.
E.

Router#show interfaces
Router#show ip protocols
Router#debug interface
Router#show ip interface brief
Router#show start

Correct Answer: AD
Section: (none)
Explanation
Explanation/Reference:
Explanation
Only two commands "show interfaces" and "show ip interface brief" reveal the status of router interfaces (up/up, for example). The outputs of two commands are shown below:

QUESTION 3
What must occur before a workstation can exchange HTTP packets with a web server? A.
B.
C.
D.
E.
F.

A UDP connection must be established between the workstation and its default gateway. A UDP connection must be established between the workstation and the web server. A TCP connection must be established between the workstation and its default gateway. A TCP connection must be established between the workstation and the web server. An ICMP connection must be established between the workstation and its default gateway. An...
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