A.link bandwidth
B.hop count
C.link cost
D.administrative distance

A.配置不當，防火墻會引起嚴重問題
B.很多應用不能安全通過防火墻
C.用戶可能會積極尋找繞過防火期接收被阻信息的方法，使網(wǎng)絡遭受潛在攻擊的危險
D.未授權的流量可能經(jīng)隧道或隱藏在合法的流量中通過防火墻

A.SMTP
B.Telnet
C.FTP
D.DNS

A.The command is accepted and the respective VLAN is added to vlan dat.
B.The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.The port turns amber.

A.防止敏感用戶和應用暴露于不受信任的用戶前
B.網(wǎng)絡性能提升
C.凈化協(xié)議流量，防止暴露協(xié)議漏洞
D.正確的配置防火墻后，使得安全策略的實現(xiàn)更簡單、可擴展、更健壯

A.RIP is an example of distance vector routing protocols.
B.Updates are periodic and include the entire routing table.
C.Routing updates are sent only after topology changes
D.The protocol can be useful in hub-and-spoke and hierarchical networks.
E.Convergence is usually faster than with link state protocols
F.Each router has its own view of the topology

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
E.10.10.0.0/16 subnetted with mask 255.255.255.252

A.ICMP消息
B.Traceroute
C.DOS TCP SYN
D.DOS smurf

A.Addresses are allocated after a negotiation between the server and the host to determine the length ofthe agreement.
B.Addresses are assigned for a fixed period of time.At the end of period，a newquest for an address mustbe made ，and another address is then assigned.
C.Addresses are leased to host.A host will usually keep the same address by periodicallycontacting theDHCP sever to renew the lease.
D.Addresses are permanently assigned so that the host uses the same address at all times.

A.spanning-tree backbonefast
B.spanning-tree uplinkfast
C.spanning-tree portfast
D.spanning-tree cost512