多項選擇題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.

5.多項選擇題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

6.多項選擇題Which two benefits are provided by using a hierarchical addressing network addressing scheme?（）

A. reduces routing table entries
B. auto-negotiation of media rates
C. efficient utilization of MAC addresses
D. dedicated communications between devices
E. ease of management and trouble shooting

7.多項選擇題Which two tasks does the Dynamic Host Configuration Protocol perform?（）

A. Set the IP gateway to be used by the network.
B. Perform host discovery used DHCPDISCOVER message.
C. Configure IP address parameters from DHCP server to a host.
D. Provide an easy management of layer 3 devices.
E. Monitor IP performance using the DHCP server.
F. Assign and renew IP address from the default pool.

8.多項選擇題Which three statements are typical characteristics of VLAN arrangements?（）

A. A new switch has no VLANs configured.
B. Connectivity between VLANs requires a Layer 3 device.
C. VLANs typically decrease the number of collision domains.
D. Each VLAN uses a separate address space.
E. A switch maintains a separate bridging table for each VLAN.
F. VLANs cannot span multiple switches.

9.多項選擇題A network administrator changes the configuration register to 0x2142 and reboots the router. What are two results of making this change?（）

A. The IOS image will be ignored.
B. The router will prompt to enter initial configuration mode.
C. The router will boot to ROM.
D. Any configuration entries in NVRAM will be ignored.
E. The configuration in flash memory will be booted.

10.多項選擇題Which two values are used by Spanning Tree Protocol to elect a root bridge?（）

A. amount of RAM
B. bridge priority
C. IOS version
D. IP address
E. MAC address
F. speed of the links