多項(xiàng)選擇題Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true?（）

A. Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.
B. Router C will use ICMP to inform Router B that Host 2 cannot be reached.
C. Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.
D. Router C will send a Destination Unreachable message type.
E. Router C will send a Router Selection message type.
F. Router C will send a Source Quench message type.


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1.多項(xiàng)選擇題When a DHCP server is configured, which two IP addresses should never be assignable to hosts?（）

A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server

2.多項(xiàng)選擇題Which two statements about the use of VLANs to segment a network are true?（）

A. VLANs increase the size of collision domains.
B. VLANs allow logical grouping of users by function.
C. VLANs simplify switch administration.
D. VLANs enhance network security.

4.多項(xiàng)選擇題Which two link protocols are used to carry multiple VLANs over a single link?（）

A.VTP
B.802.1q
C.IGP
D.ISL
E.802.3u

5.多項(xiàng)選擇題Which two benefits are provided by creating VLANs?（）

A. added security
B. dedicated bandwidth
C. provides segmentation
D. allows switches to route traffic between subinterfaces
E. contains collisions