Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)A．Each device on the Ethernet segment stops transmitting for a short time.B．A jam signal info
题目
Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)
A．Each device on the Ethernet segment stops transmitting for a short time.
B．A jam signal informs all devices that a collision occurred.
C．When data transmission resumes, the devices that were involved in the collision have priority to transmit.
D．The devices that are involved in the collision stops transmitting for a short time.
E．The collision invokes a random back-off algorithm.
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更多“Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)A．Each device on the Ethernet segment stops transmitting for a short time.B．A jam signal info”相关问题
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第1题：
The Ezonexam network administrator wants to use a router named VE1 to segment the local network. What are some of the advantages of using VE1 to segment the network? (Choose two)
A. Routers generally cost less than switches
B. Filtering can occur based on Layer 3 information
C. Broadcasts are not forwarded across the router
D. Broadcasts are eliminated
E. Adding a router to the network decreases latency
F. Routers can generally support more LAN ports than switches
正确答案：BC
B,C -
第2题：
You are experiencing intermittent issues relating to congestion within the Ezonexam network. What are the possible causes of congestion on this LAN? (Choose all that apply)
A. A broadcast domain with too many hosts.
B. Full duplex operation.
C. Broadcast storms.
D. Multicasting.
E. Network Segmentation.
F. Low bandwidth.
正确答案：ACF
A,C,F 解析：Explanation:
A LAN segment with too many hosts can mean that there are a large number of stations contending for bandwidth. It can also mean an increase in the number of collisions on the segment, which can cause further congestion issues.
Broadcast storms are the result of a large number of broadcasts sent over the LAN. Because each station listens to these broadcast messages, congestion can occur quickly. Finally, low bandwidth can simply mean that the LAN can not process all of the LAN traffic that is being sent. This can mean that TCP sessions are retransmitted, which can lead to additional congestion.
Incorrect Answers:
B. This can alleviate congestion, as data can be sent and received at the same time. In addition, collisions are not possible in a full duplex LAN.
D. Multicasting can actually alleviate congestion issues, as single streams of information can reach multiple hosts at the same time, instead of using a series of point to point
connections.
E. Segmentation breaks up a large LAN into multiple, smaller LANS. This will mean fewer hosts per broadcast domain.
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第3题：
The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.
Which of the following are layer 1 devices that you can use? (Choose all that apply.)
A．A switch
B．A router
C．A network adapter card
D．A hub
E．A repeater
正确答案：DE
解析：Explanation:
A hub simply repeats the electrical signal and makes no attempt to interpret the electrical signal (layer 1) as a LAN frame. (Layer 2). So, a hub actually performs OSI layer 1 functions, repeating an electrical signal, whereas a switch performs OSI layer 2 functions, actually interpreting Ethernet header information, particularly addresses, to make forwarding decisions. Hubs can be used to increase the number of stations that can be supported on a LAN.
Because the repeater does not interpret what the bits mean, but does examine and generate electrical signals, a repeater is considered to operate at Layer 1. Repeaters can be used to physically extend the LAN to greater distances.
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第4题：
With regard to Ethernet media access methods, which of the following are true?
(Choose all that apply.)
A．A device waits for an electronic signal before transmitting.
B．A device listens and waits until the media is not busy before transmitting.
C．All devices on an Ethernet segment see data that passes on the network medium.
D．Only the sender and the receiver devices see data that passes on the network medium.
E．Ethernet networks allow you to configured devises with higher transmission priority.
正确答案：BC
解析：Explanation:
Ethernet uses the CSMA/CD access method.
CSMA/CD logic helps prevent collisions and also defines how to act when a collision does occur. The CSMA/CD algorithm words like this:
1. A device with a frame. to send listens until the Ethernet is not busy.
2. When the Ethernet is not busy, the sender begins sending the frame.
3. The sender listens to make sure that no collision occurred.
4. Once the senders hear the collision, they each send a jamming signal, to ensure that all stations recognize the collision.
5. After the jamming is complete, each sender randomizes a timer and waits that long.
6 When each timer expires, the process starts over with Step 1.
So, all devices on the Ethernet need to use CSMA/CD to avoid collisions and to recover when inadvertent collisions occur.
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第5题：
In an Ethernet network, under what two scenarios can devices transmit?()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
参考答案：C, D
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第6题：
Two devices on an Ethernet segment sent frames at the same time causing a collision. Which twostatements are true?（）
- A、Both devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmit
- B、The device with the lowest MAC address is permitted to retrannsmit first
- C、The device with the lowest MAC address sends a jam signal to notify all other devices of the collision
- D、Both devices send a jam signal to notify all other devices of the collision
正确答案:A,D -
第7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8题：
With regard to Ethernet media access methods, which of the following are true?（）
- A、A device waits for an electronic signal before transmitting.
- B、A device listens and waits until the media is not busy before transmitting.
- C、All devices on an Ethernet segment see data that passes on the network medium.
- D、Only the sender and the receiver devices see data that passes on the network medium.
- E、Ethernet networks allow you to configured devises with higher transmission priority.
正确答案:B,C -
第9题：
Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?（）
- A、Both devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmit
- B、The device with the lowest MAC address is permitted to retrannsmit first
- C、The device with the lowest MAC address sends a jam signal to notify all other devices of the collision
- D、Both devices send a jam signal to notify all other devices of the collision
正确答案:A,D -
第10题：
多选题With regard to Ethernet media access methods, which of the following are true?（）AA device waits for an electronic signal before transmitting.
BA device listens and waits until the media is not busy before transmitting.
CAll devices on an Ethernet segment see data that passes on the network medium.
DOnly the sender and the receiver devices see data that passes on the network medium.
EEthernet networks allow you to configured devises with higher transmission priority.
正确答案： D,B解析： 暂无解析 -
第11题：
多选题Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?（）ABoth devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmit
BThe device with the lowest MAC address is permitted to retrannsmit first
CThe device with the lowest MAC address sends a jam signal to notify all other devices of the collision
DBoth devices send a jam signal to notify all other devices of the collision
正确答案： C,D解析： 暂无解析 -
第12题：
单选题On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）AThe destination host sends a request to the source for retransmission.
BThe jam signal indicates that the collision has been cleared.
CThe hosts will attempt to resume transmission after a time delay has expired.
DAn electrical pulse indicates that the collision has cleared.
EThe router on the segment will signal that the collision has cleared.
FThe hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
正确答案： B解析： 暂无解析 -
第13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.
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第14题：
Ezonexam is installing IP phones in a new office. The phones and office computers connect to the same device. To ensure maximum throughout for the phone data sessions, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers and what technology should be implemented on this device? (Choose two)
A. VLAN
B. Subinterface
C. STP
D. Hub
E. Switch
F. Router
G. Wireless Access Point
H. VTP
正确答案：AE
A,E -
第15题：
Which two considerations must you take into account when deploying a Junos Pulse Access Control Service cluster?()A. State synchronization occurs only through the internal network interface card (NIC)
B. Latency of the WAN must be less than 300 ms.
C. Authenticating endpoints must be on the same LAN segment.
D. Cluster members must use the same hardware platfor
参考答案：A, D
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第16题：
Two stations on a LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network?()A. Each device on the Ethernet segment stops transmitting for a short time.
B. A jam signal informs all devices that a collision occurred.
C. When data transmission resumes, the devices that were involved in the collision have priority to transmit.
D. The devices that are involved in the collision stops transmitting for a short time.
E. The collision invokes a random back-off algorithm.
参考答案：B, D, E
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第17题：
On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）
- A、The destination host sends a request to the source for retransmission.
- B、The jam signal indicates that the collision has been cleared.
- C、The hosts will attempt to resume transmission after a time delay has expired.
- D、An electrical pulse indicates that the collision has cleared.
- E、The router on the segment will signal that the collision has cleared.
- F、The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
正确答案:C -
第18题：
Which two considerations must you take into account when deploying a Junos Pulse Access Control Service cluster?（）
- A、State synchronization occurs only through the internal network interface card (NIC)
- B、Latency of the WAN must be less than 300 ms.
- C、Authenticating endpoints must be on the same LAN segment.
- D、Cluster members must use the same hardware platfor
正确答案:A,D -
第19题：
In an Ethernet network, under what two scenarios can devices transmit?（）
- 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
正确答案:C,D -
第20题：
Two devices on an Ethernet segment sent frames at the same time causing a collision.Which two statements are true?（）
- A、Both devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.
- B、The device with the lowest MAC address is permitted to retransmit first.
- C、The device with the lowest MAC address sends a jam signal to notify all other devices of the collision.
- D、Both devices send a jam signal to notify all other devices of the collision.
正确答案:A,D -
第21题：
Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?（）
- A、Both devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.
- B、The device with the lowest MAC address is permitted to retransmit first.
- C、The device with the lowest MAC address sends a jam signal to notify all other devices of the collision.
- D、Both devices send a jam signal to notify all other devices of the collision.
正确答案:A,D -
第22题：
多选题Two stations on a LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network?（）AEach device on the Ethernet segment stops transmitting for a short time.
BA jam signal informs all devices that a collision occurred.
CWhen data transmission resumes, the devices that were involved in the collision have priority to transmit.
DThe devices that are involved in the collision stops transmitting for a short time.
EThe collision invokes a random back-off algorithm.
正确答案： C,E解析： 暂无解析 -
第23题：
单选题All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.Aevery station in one chain to transmit at the same time
Beach station to transmit without reference to another station
Con-line transmission of single-line transmitters at the same time
Deach station to only depend on the master for synchronization and signal ratio
正确答案： C解析： 暂无解析