Based on DSCP, which option description is correct?
A. IP precedence and DSCP have no overlap part 
B. DSCP's CS is backward compatible with IP precedence
C. DSCP and IP precedence is completely the same; the name change is just the practice of marketing orders
D. DSCP's last two bit and IP precedence overlapping
E. DSCP only for TCP, IP precedence only for UDP
Answer: B

In traffic monitoring policing, using double barrel double speed, the number of tokens in C bucket is TC, the number of tokens in P bucket is TB. When a message whose length is B enters, which of the description is correct? (Please select three correct answers)
A. If TP-B>0 and TC-B>0, the message is marked green
B. If TP-B>0 and TC-B<0, the message is marked yellow
C. If TP-B<0 and TC-B<0, the message is marked red
D. If TP-B>0 and TC-B<0, the message is marked green
Answer: ABC

What characteristics does Syslog information have? (Multiple Choice)
A. Syslog message transmission is reliable
B. Syslog message transmission is safe
C. Syslog message Transmission is confirmable
D. Syslog message transmission is not reliable
E. Syslog message Transmission is not confirmable
F. Syslog transmission is unsafe
Answer: DEF

The users want the router to forward the packet and choose the routing according to their own defined policy and based on traditional routing forwarding. In order to implement the goal, you can use policy routing.
Which of the following description about policy routing is wrong?
A. policy routing can not be used to set the IP precedence
B. policy routing can't set the DSCP routing in a statement 
C. policy routing can set the next-hop IP address
D. policy routing can be used to match a message length
Answer: A

Which of the following description about OSPF adjacency and link-state database synchronization is correct?
A. When the OSPF router status reaches LOADING state, then FULL adjacency forms
B. adjacency begins from EXSTART state 
C. In the broadcast network, FULL adjacency will be formed among all routers 
D. INIT state indicates that the router has received Hello message from the neighbor, and the Hello message has already contained its own Router ID
Answer: B

What benefits can the link bring after enabling WRED? (Multiple choice)
A. thoroughly to avoid congestion
B. Avoid TCP synchronization
C. offer a minimum bandwidth guarantee
D. provide a certain amount of low latency
E. can avoid UDP taking up most of the bandwidth when congestion
Answer: BE

Using WRED can avoid congestion.
Which of the following scenarios can have a better effect on deploying WRED?
A. it is mainly UDP traffic in network.
B. it is mainly TCP traffic in network.
C. deploy on low-bandwidth links.
D. deploy on the serial link.
E. WRED random packet loss, the effect has nothing to do with the scene.
Answer: B

Which of the following is access control method which is provided by the NAC? (Multiple choice)
A. 802.1x authentication
B. AAA authentication
C. MAC address authentication
D. Web authentication
Answer: ACD

Command ip as-path-filter as-path-filter-number {deny | permit} regular-expression is used to configure AS-path-filter. On this command, many clause may form as-path-filter sentence.
So what is the relationship between multiple statements?
A. and relationship
B. or relationship
C. routing sequential matching, after a route match to a clause, no longer matching downward
D. routing sequential matching and routing must match all clauses
Answer: C

Which of the following description about Smart-link is correct? (Multiple choice)
A. Smart-link can be mixed used with STPbat the interface.
B. Smart-link supports loading balancing.
C. Smart-link mainly includes the master port and the slave port two roles.
D. Smart-link can't detect up and down link status
Answer: BC

In multicast networks, what conditions will lead to forwarding the multicast traffic failure? (Multiple Choice)
A. the router doesn't have RPF routing
B. there is no enabling PIM on the RPF interface
C. upstream router will discard the received PIM Join message
D. Multi-routers outlet network, this router is not DR
Answer: ABC

Which of the following description about the Register messages of PIM-SM is correct? (Multiple Choice)
A. Register messages are sent by the recipient router
B. Register messages can make RP learn the multicast source information
C. Register messages are sent by source's DR
D. Register message are sent to RP via unicast instead of multicast
Answer: BCD

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