Question 21
Which of the following statement about packet marking is false?
A. TheQosInfo field of the packet can be marked.
B. The DSCP and IP precedence fields of the IP packet can be marked.
C. The 802.1p field of the VLAN packet can be marked.
D. The IP address of the packet can be marked.
Question 22
BFD (a fast detection technology) enabled on a device quickly identifies a fault and reports the fault to the appropriate protocol module after detecting a master/ slave switchover on the neighboring device. This causes the protocol module to quit the GR. As such, BFD and GR cannot be used together.
A. True
B. False
Question 23
QoS can be performed in which of the following modes? (Choose three.)
A. Best-effort service
B. Integrated service
C. Differentiated service
D. Assured forwarding service
Question 24
Exhibit:Based on the DSCP field (first 6 bits of the ToS field), packets can be classified into how many types?
A. 4
B. 8
C. 16
D. 64
Question 25
Simple traffic classification can be performed based on which of the following information in VLAN packets?
A. DSCP
B. IP precedence
C. MPLX EXP
D. 802.1p
Question 26
The dynamic LACP requires devices at both ends to exchange protocol packets, while the static LACP does not require so.
A. True
B. False
Question 27
Which of the following statements about VRRP fast switchover are true? (Choose three.)
A. When VRRP is used to track a BFD or EFM session, if a tracked BFD or EFM session status changes, the BFD or EFM module notifies the VRRP module of the change. After that, the VRRP module implements a rapid master/backup switchover.
B. A VRRP backup group can monitor a peer BFD session, a link BFD session, and a normal BFD session at the same time. In addition, it can monitor the interface status.
C. When the status of a BFD session detected by a VRRP backup group changes, the master/slave switchover of routers in the VRRP backup group occurs by changing priorities of the master and slave routers.
D. A VRRP backup group can monitor several BFD sessions at the same time. The status changes of these BFD sessions affect each other.
Question 28
Which of the following numbers is the protocol number of VRRP packets?
A. 112
B. 113
C. 114
D. 115
Question 29
Traffic shaping usually buffers packets that need to be dropped by traffic policing by means of buffer and token bucket.
A. True
B. False
Question 30
In case of congestion, which of the following indexes will affect QoS? (Choose three.)
A. Transmission delay
B. Transmission jitter
C. Packet loss ratio
D. Transmission distance
