Part I (10%) Show the IEEE standard IEEE Standard Description 802.3 10Base2, 10B
ID: 3890895 • Letter: P
Question
Part I (10%) Show the IEEE standard
IEEE Standard
Description
802.3
10Base2, 10Base5, 10BaseT
Full Duplex Flow Control
Spanning Tree Algorithm and Protocol (STP)
Rapid STP
Link Aggregation
Quality of Service (QoS)
Part II. (28%) Multiple Choice Questions (only one answer)
1. What is the operation mode of most modern Ethernet switches?
A. Cut-through
B. Store-and-forward
C. Modified cut-through
D. Broadcast
E. None of the above
1. Which of the following is not an STP state?
A. listening
B. learning
C. talking
D. forwarding
E. blocking
4. Which of the following is an STP state but not an RSTP state?
A. listening
B. learning
C. talking
D. forwarding
E. blocking
4. Which of the following is NOT a timer used by STP?
A. Hello Timer
B. Max [Messge] Age Timer
C. Forward Delay Timer
D. Acknoeledge (ACK) Timer
E. All are valid STP timers
5.Which of the following is an advantage of RSTP (compared to STP)?
A. It has shorter fail-over time.
B. It is easier to configure.
C. Its software is less expensive..
D. It has higher throughput.
E. None of the above.
6. Which of the following is a correct descriptiom of RSTP?
A. It does not need a root switch.
B. A non-root switch simly relays BPDU to other switches.
C. A non-root switch also sends BPDU periodically (defined by Hello Time).
D. When a link failure is detected, all ports are reset to the blocking state..
E. None of the above
7. How does Half Duplex Ethernet implement the flow control function?
A. The receiver sends a frame to cause collision.
B. It applies 802.3x to implement flow control.
C. The MAC sublayer does not do flow control.
D. The sender waits for acknowledgement from the receiver.
E. None of the above
8. What is the MAC control frame defined in 802.3x?
A. STOP
B. ACK
C. CONTROL
D. PAUSE
E. WAIT
9. How many VLANs can be defined by the 802.1Q standard?
A. 64
B. 128
C. 512
D. 1024
E. 4096
10. What is the max frame size of an 802.1Q tagged frame?
A. 1024 bytes
B. 1500 bytes
C. 1522 bytes
D. 65536 bytes
E. depends on the physical layer
11. If the Hello Timer is 2 seconds, which is the general (e.g., non LOS) failure detection time in RSTP?
A. 1 sec
B. 2 sec
C. 4 sec
D. 6 sec
E. all are valid timer valures.
12. How does switch/bridge exchange control informaiton with one another?
A. via Data PDU
B. via Signaling PDU
C.via Switch PDU
D. via Bridge PDU
E. via Control PDU
13. How many priority queues can be specified in an 802.1p-enabled frame?
A. 2
B. 4
C. 8
D. 16
E. 1024
14. VLAN ID is added to the 802.1Q tagged frame by
A. sending workstation
B. ingress switch
C. egress switch
D. receiving workstation
E. user application
IEEE Standard
Description
802.3
10Base2, 10Base5, 10BaseT
Full Duplex Flow Control
Spanning Tree Algorithm and Protocol (STP)
Rapid STP
Link Aggregation
Quality of Service (QoS)
Explanation / Answer
Answers:
1.(A).Cut-through.
2.(C).talking
There are only 4 states in stp,a.listening b.Learning,c.forwarding d.Blocking
3.(D).Forwarding
4.(D)Acknowledgement Timer(Actually there is No Timer is there like this)
5 (D)It has high Throughput.
6.(A).It does not need a root switch.
7. (D). The sender waits for acknowledgement from the receiver.
8.(D).PAUSE
9.(E).4096
10.(C)1522 bytes(The two other sizes are basic frames, with a maximum size of 1,518 bytes, and Q-tagged frames with a maximum of 1,522 bytes.)
11.(C)
12.(D) via Bridge PDU.
13.(C.) 8(0 to 7 bits)
14. (D.) receiving workstation
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