單項選擇題You are deploying two core switches, one in each building, 50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state, and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up? ()

A. The switches are not the same model
B. You are not using the correct SFP
C. You are not using correct optical media converters
D. Configuration should be modified, because the distance is longer


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1.多項選擇題Your company is researching a new application that runs over IPv6, but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the whole network, but to segment parts of the network or even to operate simultaneously with IPv6 and IPv4. You must make a brief presentation about IPv6 technology to the board of technical directors. Which three of these items could be part of your presentation? ()

A. Tunnel IPv6 over IPv4 to connect far-end IPv6 networks
B. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible
C. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible
D. What is the meaning of EUI-64 and how does it work?
E. Tunnel IPv4 over IPv6 to connect far-end IPv4 networks.

2.單項選擇題What is a characteristic of Network Time Protocol?()

A.NTP updates are sent in the timezone they are collected in,and the syslog server will adjust based  on the input time.
B.NTP authentication verifies the source,not the recipient.
C.NTP authentication requires that the recipient has multiple strata clocks to ensure accuracy.
D.Secure NTP can be configured to use SHA-1 hashing,since NTP is very insecure.
E.A stratum 0 clock should be configured at the core of every network,so it can connect to an accuratetime source.

3.單項選擇題

Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards, the exhibit shows your configuration in a local switch1. However, EtherChannel is not coming up. Which one of these statements could be a possible reason?()

A. EtherChannel is only available in Cisco equipment. 
B. The customer side is supposed to be running PAgP, which is a Cisco standard. 
C. PAgP is not an IEEE standard. VRRP should be used. 
D. The configuration on switch1 needs to be modified to use LACP. 

5.多項選擇題Which two statements are true about bandwidth guarantee?()

A.When congestion is present,the priority command doesn’t allow exceeding the allocated rate
B.When congestion isn’t present,the priority command doesn’t allow exceeding the allocated rate
C.When congestion is present,the priority command allows exceeding the allocated rate
D.When congestion isn’t present,the priority command allows exceeding the allocated rate

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