單項選擇題How does a DHCP server dynamically assign IP addresses to hosts?（）

A.Addresses are permanently assigned so that the host uses the same address at all times.
B.Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.
C.Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.
D.Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.


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2.單項選擇題On which options are standard access lists based?（）

A.destination address and wildcard mask
B.source address and wildcard mask
C.destination address and subnet mask
D.source address and subnet mask

3.多項選擇題What are two benefits of using NAT?（）

A.NAT protects network security because private networks are not advertised.
B.NAT accelerates the routing process because no modifications are made on the packets.
C.Dynamic NAT facilitates connections from the outside of the network.
D.NAT facilitates end-to-end communication when IPsec is enable.
E.NAT eliminates the need to re-address all host that require extemal access.
F.NAT conserves addresses through host MAC-level multiplexing.

4.單項選擇題Which statement describes the process of dynamically assigning IP addresses by the DHCP server?（）

A.Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B.Addresses are permanently assigned so that the hosts uses the same address at all times.
C.Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.
D.Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.

5.單項選擇題

Refer to the exhibit. What statement is true of the configuration for this network?（）

A.The configuration that is shown provides inadequate outside address space for translation of the number of inside addresses that are supported.
B.Because of the addressing on interface FastEthernet0/1, the Serial0/0 interface address will not support the NAT configuration as shown.
C.The number 1 referred to in the ip nat inside souce command recerences access-list number 1.
D.ExternalRouter must be configured with static routers to network 172.16.2.0/24