防火墙有哪些类型（）

多项选择题防火墙有哪些类型（）

A.边际防火墙
B.状态防火墙
C.软件防火墙
D.应用网关防火墙

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1.单项选择题Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic protocol is also being used?（）

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

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2.多项选择题下列哪些是防火墙的局限性（）

A.配置不当，防火墙会引起严重问题
B.很多应用不能安全通过防火墙
C.用户可能会积极寻找绕过防火期接收被阻信息的方法，使网络遭受潜在攻击的危险
D.未授权的流量可能经隧道或隐藏在合法的流量中通过防火墙

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3.单项选择题Which of the following protocols uses both TCP and UDP ports？（）

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

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4.单项选择题VLAN 3 is not yet configured on your switch.What happens if you set the switchport access vlan 3 commmand interface configuration mode?（）

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.

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5.多项选择题网络中使用防火墙有哪些好处（）

A.防止敏感用户和应用暴露于不受信任的用户前
B.网络性能提升
C.净化协议流量，防止暴露协议漏洞
D.正确的配置防火墙后，使得安全策略的实现更简单、可扩展、更健壮

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6.多项选择题Which two statements are characteristics of a distance vector routing protocol？（）

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

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7.单项选择题The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?（）

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

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8.多项选择题使用ACL可以过滤哪些流量（）

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

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9.单项选择题How dose a DHCP server dynamically assign IP address to host？（）

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.

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10.单项选择题Which command enhances the 802.1D convergence time on ports that are connected to hosts？（）

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

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