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4 Cards in this Set
- Front
- Back
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For which type of connection should a straight-through cable be used?
A. switch to switch B. switch to hub C. switch to router D. hub to hub E. router to PC |
Answer: C
Explanation To specify when we use crossover cable or straight-through cable, we should remember: Group 1: Router, Host, Server Group 2: Hub, Switch One device in group 1 + One device in group 2: use straight-through cable Two devices in the same group: use crossover cable In this case we can use straight-through cable to connect a switch to a router -> C is correct. |
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Question 2
Which type of cable is used to connect the COM port of a host to the COM port of a router or switch? A. crossover B. straight-through C. rolled D. shielded twisted-pair |
Answer: C
Explanation The correct question should be “Which type of cable is used to connect the COM port of a host to the CONSOLE port of a router or switch?” and the correct answer is rollover cable. But we can’t plug this rollover cable directly into our host because it will not work. We often use a RJ45 to DB9 Female cable converter as shown below: |
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Question 3
What is the first 24 bits in a MAC address called? A. NIC B. BIA C. OUI D. VAI |
Answer: C
Explanation Organizational Unique Identifier (OUI) is the first 24 bits of a MAC address for a network device, which indicates the specific vendor for that device as assigned by the Institute of Electrical and Electronics Engineers, Incorporated (IEEE). This identifier uniquely identifies a vendor, manufacturer, or an organization. |
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Question 4
In an Ethernet network, under what two scenarios can devices transmit? (Choose two) A. when they receive a special token B. when there is a carrier C. when they detect no other devices are sending D. when the medium is idle E. when the server grants access |
Answer: C D
Explanation Ethernet network is a shared environment so all devices have the right to access to the medium. If more than one device transmits simultaneously, the signals collide and can not reach the destination. If a device detects another device is sending, it will wait for a specified amount of time before attempting to transmit. When there is no traffic detected, a device will transmit its message. While this transmission is occurring, the device continues to listen for traffic or collisions on the LAN. After the message is sent, the device returns to its default listening mode. So we can see C and D are the correct answers. But in fact “answer C – when they detect no other devices are sending” and “when the medium is idle” are nearly the same. |
