1) What fields does the IEEE Ethernet frame contain (select two)?

A. Source MAC address and destination MAC address

B. source network address and destination network address

C. source MAC address and destination MAC address and source network address and destination network address

D. FCS field

answer: a, d

< 2) which two of the following are the characteristics of half duplex Ethernet compared with full duplex Ethernet?

A. Half duplex Ethernet runs in a shared conflict domain

B. half duplex Ethernet runs in a dedicated conflict domain

C. half duplex Ethernet has higher effective throughput

D. half duplex Ethernet has lower effective throughput

E. half duplex Ethernet runs in a dedicated broadcast domain

answer: A, D

3) what kind of cable should you use to realize a network that is not susceptible to EMI?

A. Thick coaxial cable

B. thin coaxial cable

C.5 UTP cable

D. optical fiber

answer: d

4) can full duplex mode be used for the following three connections?

A. Hub to hub

B. switch to switch

C. host to host

D. switch to hub

E. switch to host

answer: B, C, e

< 5) which RJ45 UTP cable is used between switches?

A. Through cable ﹣ B. cross cable ﹣ C. cross cable with CSU / DSUA router is added to each switch and connected to the router by using cross cables.

answer: B

6) after a conflict occurs, how does the host in the Ethernet LAN know when to start transmission (select two items)?

A. In the CSMA / CD conflict domain, multiple workstations can transmit data at the same time

B. in the CSMA / CD conflict domain, the workstation must log on to the media not occupied before transmitting

C. The CSMA / CD network can be improved by adding a hub

D. after the conflict occurs, the workstation that detects the conflict has priority to retransmit the lost data

E. after the conflict occurs, all workstations are in operation After the backward delay phase, the data transmission priority of all workstations is the same.

F. After the collision, all workstations run the same backoff algorithm, and then synchronize with each other before data transmission

answer: be

7) which type of RJ45 UTP cable should be used when connecting the COM port of PC to the console port of router or switch?

A. Through cable

B. cross cable

C. cross cable with CSU / DSU

D. reverse cable

answer: d

8) what are the decimal and hexadecimal values corresponding to binary value 10110111?

A. 69 / 0x2102

b.183/b7

c.173/a6

d.83/0xc5

answer: B

< 9) which of the following competition mechanisms does Ethernet use?

A token passing?

b.csma/cd

c.csma/ca

D. host polling

answer: B

10) in CSMA / CD, which hosts have priority after the arrival delay calculated by backoff algorithm?

A. All hosts have the same priority. B. the two hosts causing the conflict have the same priority.

C. after the conflict, the host sending the conflict congestion signal has priority. D. the host with the largest MAC address has priority.

answer: a

11) which of the following statements is correct?

A. Full duplex Ethernet uses one pair of wires

B. full duplex Ethernet uses two pairs of wires

C. half duplex Ethernet uses two teams of wires

D. full duplex Ethernet uses three pairs of wires

answer: B

12) which of the following statements is wrong?

A. No collision in full duplex mode?

B. Each full duplex node must have a dedicated switch port

C. There are few conflicts in full duplex mode

D. the network card and switch port of the host must be able to operate in full duplex mode

answer: C

13) which of the following statements about MAC address is correct?

A. MAC address, also known as logical address, is 48 bits long (6b), which is expressed in hexadecimal format

BMAC address is also called hardware address, 48 bits long (8B), expressed in hexadecimal format

c.mac address is also called hardware address, 48 bits long (6b), expressed in binary format

d.mac address is also called hardware address, 48 bits long (6b), expressed in hexadecimal format

answer: d

14) which part of MAC address is called organization unique identifier (oui) ？

A. First 24 bits (3b)

B. first 12 bits (3b)

C. first 24 bits (6b)

D. first 32 bits (3b)

answer: a

15) which layer of OSI mode is responsible for combining bits into bytes and combining bytes into frames?

A. Representation layer

B. data link layer

C. application layer

D. transmission layer

answer: B

16) which of the following terms represents the unwanted signal interference between adjacent pairs?

A. EMI

b.rfi

C. crosstalk

D. attenuation

answer: C

17) which of the following is part of IEEE 802.3u standard?

A. 100base2

b.10base5

c.100base TX

d.1000base-t

answer: C

18) what kind of IEEE standard is 10GBASE long wavelength?

A.802.3F

B.802.3z

C.802.3ab

D.802.3AE

answer: d

< 19) which of the following IEEE standards is 1000BASE-T?

A. 802.3f

b.802.3z

c.802.3ab

d.802.3ae

answer: C

20) when establishing a HyperTerminal connection, what bit rate must be set to?

A.2400 bit/s

B.1200 bit/s

C.9600 bit/s?

D.6400 Bit / s

answer: C

CCNA examination analysis
In 2020, the new version of CCNA has no professional direction, no matter what the future development of individuals is in the field of enterprise or DC, security or cooperation, now we only need to study one CCNA course and take one certification

New CCNA outline

1. Network foundation

2. routing protocol

3. switching protocol

4.wireless network architecture

5. Network Security Foundation (New)

6.Automation and programmability (New)

New CCNA content
Understand Cisco Wireless Access Solution (New) realize centralized deployment of Cisco Wireless * (New) master network security principles and common security threats protection (New) Master Cisco software defined network access * (New) master network operation and maintenance automation and programmable network * (New)

This is an important direction for the development of Cisco network architecture, and it is also a must for CCIE enterprises.

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