多选题Which two statements are true regarding an Ethernet collision domain?()AIf a switch is used, the collision domain is limited to each device and the switchBIf a hub is used, the collision domain is limited to each device and the hubCIf a hub is used, th

题目
多选题
Which two statements are true regarding an Ethernet collision domain?()
A

If a switch is used, the collision domain is limited to each device and the switch

B

If a hub is used, the collision domain is limited to each device and the hub

C

If a hub is used, the collision domain includes all devices connected to the hub

D

If a switch is used, the collision domain includes all devices connected to the switch

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第1题:

Which of the following a true statements regarding the use of VLANs to segment a network? (Select three)

A. They increase the size of collision domains

B. They allow logical grouping of users by function.

C. They can enhance network security.

D. They increase the size of the broadcast domain while decreasing the number of collision domains.

E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

F. They simplify switch administration.


正确答案:BCE
B,C,E 解析:Explanation:
VLANs are used to segment a LAN into multiple, smaller LANs. This can be used to enhance security as local traffic from one VLAN will not be passed to users in other VLANS.

Incorrect Answers:
A. VLANs are used to decrease the size of a collision domain, not increase it.

D. The opposite is true.

F. The default operation of a switch is to allow all traffic and to enable all ports in VLAN1. The use of VLANs will increase the complexity of the switch environment, making for more difficult administration.

第2题:

What are the differences between full-duplex Ethernet and half-duplex Ethernet?()

A. Half-duplex Ethernet operates in a shared collision domain.

B. Full-duplex Ethernet has a lower effective throughput.

C. Half-duplex Ethernet operates in a private collision domain.

D. Full-duplex Ethernet allows two-way communication.

E. Half-duplex Ethernet operates in a private broadcast domain.


参考答案:A, D

第3题:

When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

A.Half-duplex Ethernet operates in a shared collision domain.

B.Half-duplex Ethernet operates in an exclusive broadcast domain.

C.Half-duplex Ethernet has efficient throughput.

D.Half-duplex Ethernet has lower effective throughput.

E.Half-duplex Ethernet operates in an exclusive collision domain.


正确答案:AD
解析:Explanation:
A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame. while receiving a frame. That logic is called half-duplex logic.

Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

Incorrect Answers:
B. Full duplex effectively doubles the throughput of half-duplex operation, because data can be both sent and received at the full 10/100 speed.

C, E. In half duplex operation, the network is shared between all devices in the collision domain.

第4题:

When comparing and contrasting the similarities and differences between bridges and switches, which of the following are valid statements?()

  • A、Bridges are faster than switches because they have fewer ports.
  • B、A switch is a multiport bridge,
  • C、Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
  • D、A bridge will forward a broadcast but a switch will not.
  • E、Bridges and switches increase the size of a collision domain.
  • F、None of the above statements are true.

正确答案:B,C

第5题:

Which statement is true regarding an Ethernet collision domain?()

  • A、If a router is used, the collision domain includes all devices connected to the router.
  • B、If a hub is used, the collision domain is limited to each device and the hub.
  • C、If a switch is used, the collision domain is limited to each device and the switch.
  • D、If a bridge is used, the collision domain includes all devices connected to the bridge.

正确答案:C

第6题:

Which of the following contribute to congestion on an Ethernet network?()

A. Use of full duplex mode.

B. Creation of new collision domain.

C. Creation of new broadcast domain.

D. Addition of hub to the network.

E. Use of switches in the network.

F. Amount of ARP or IPX SAP traffic.


参考答案:D, F

第7题:

Which of the following are true regarding bridges and switches?()

A. Bridges are faster than switches because they have fewer ports.

B. A switch is a multiport bridge.

C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.

D. A bridge will forward a broadcast but a switch will not.

E. Bridges and switches increase the size of a collision domain.


参考答案:B, C

第8题:

Which two statements describe the operation of the CSMA/CD access method, which is in use on the Ezonexam network? (Choose two)

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

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

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

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

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.


正确答案:BE
B,E 解析: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.

第9题:

Which two statements are true regarding an Ethernet collision domain?()

  • A、If a switch is used, the collision domain is limited to each device and the switch
  • B、If a hub is used, the collision domain is limited to each device and the hub
  • C、If a hub is used, the collision domain includes all devices connected to the hub
  • D、If a switch is used, the collision domain includes all devices connected to the switch

正确答案:A,C

第10题:

Which of the following a true statements regarding the use of VLANs to segment anetwork? ()

  • A、They increase the size of collision domains
  • B、They allow logical grouping of users by function.
  • C、They can enhance network security.
  • D、They increase the size of the broadcast domain while decreasing the number of collision domains.
  • E、They increase the number of broadcast domains while decreasing the size of the broadcast domains.
  • F、They simplify switch administration.

正确答案:B,C,E

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