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5 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which two statements describe the operation of the CSMA/CD access method? (Choose two)
A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously. B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting. C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method. D. After a collision, the station that detected the collision has first priority to resend the lost data. E. 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. F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data. |
BE
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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 |
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On a live network, which commands will verify the operational status of router interfaces? (Choose two)
A. Router#show interfaces B. Router#show ip protocols C. Router#debug interface D. Router#show ip interface brief E. Router#show start |
AD
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Only two commands “show interfaces” and “show ip interface brief” reveal the status of router interfaces (up/up, for example).
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What must occur before a workstation can exchange HTTP packets with a web server?
A. A UDP connection must be established between the workstation and its default gateway. B. A UDP connection must be established between the workstation and the web server. C. A TCP connection must be established between the workstation and its default gateway. D. A TCP connection must be established between the workstation and the web server. E. An ICMP connection must be established between the workstation and its default gateway. F. An ICMP connection must be established between the workstation and the web sewer. |
D
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HTTP is based on TCP connection so a TCP connection must be established first between the workstation and the web server.
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Refer to the exhibit. If the hubs in the graphic were replaced by switches, what would be virtually eliminated?
A. broadcast domains B. repeater domains C. Ethernet collisions D. signal amplification E. Ethernet broadcasts |
C
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Hubs do not separate collision domains so if hub is used in the topology above, we will have only 1 collision domain. Switches do separate collision domains so if hubs are replaced by switches, we would have 22 collision domains (19 collision domains for hosts and 3 collision domains among three switches. Please notice that the WAN (serial) connection is not counted as a collision (or broadcast) domain.
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If a host experiences intermittent issues that relate to congestion within a network while remaining connected, what could cause congestion on this LAN?
A. half-duplex operation B. broadcast storms C. network segmentation D. multicasting |
B
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