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1. 对于分组交换方式的理解,下列说法中正确的是 ______ 。(多选)
A) 传输的信息被划分为一定长度的分组,以分组为单位进行转发
B) 分组交换是一种基于存储转发( Store-and-Forward switching )的交换方式
C) 分组交换包括基于帧的分组交换和基于信元的分组交换
D) 每个分组都载有接收方和发送方的地址标识,分组可以不需要任何操作而直接转发,从而提高了效率
2. 客户的一台 MSR 路由通过广域网接口 S1/0 连接 Internet ,通过局域网接口 GE0/0 连接办公网络,目前办公网络用户可以正常访问 Internet 。
在路由器上增加如下的 ACL 配置:
firewall enable
firewall default deny
# acl number 3003
rule 0 deny icmp
rule 5 permit tcp destination-port eq 20
#
interface GigabitEthernet0/0
firewall packet-filter 3000 inbound
firewall packet-filter 3000 outbound
那么 ______ 。
A) 办公网用户发起的到达该路由器 GE0/0 的 Telnet 报文可以正常通过
B) 办公网用户发起的到 Internet 的 FTP 流量被允许通过该路由器,其他所有报文都被禁止通过该路由器
C) 办公网用户发起的到达该路由器的 FTP 流量可以正常通过
D) 办公网用户发起的到 Internet 的 ICMP 报文被该路由器禁止通过
3. 在路由器 MSR-1 上看到如下提示信息:
[MSR-1]display firewall-statistics all
Firewall is enable, default filtering method is 'permit'.
Interface: GigabitEthernet0/0
In-bound Policy: acl 3000
Fragments matched normally
From 2008-11-08 2:25:13 to 2008-11-08 2:25:46
0 packets, 0 bytes, 0% permitted,
4 packets, 240 bytes, 37% denied,
7 packets, 847 bytes, 63% permitted default,
0 packets, 0 bytes, 0% denied default,
Totally 7 packets, 847 bytes, 63% permitted,
Totally 4 packets, 240 bytes, 37% denied.
据此可以推测 ______ 。(多选)
A) 上述信息中的 0% denied default 意味着该 ACL 的默认匹配规则是 deny
B) 有一部分数据包没有匹配 ACL 3000 中的规则,而是匹配了默认的 permit 规则
C) 由上述信息中的 37% denied 可以看出已经有数据匹配 ACL 3000 中的规则
D) ACL 3000 被应用在 GigabitEthernet0/0 的 inbound 方向
4. 使用 ______ 命令查看 NAT 表项。
A) display nat table
B) display nat entry
C) display nat
D) display nat session
5. 某二层交换机上的 MAC 地址表如图所示。
当交换机从 E1/0/1 接口收到一个广播帧时,会将该帧 ______ 。(多选)
A) 直接丢弃
B) 从 E1/0/2 接口发送出去
C) 从交换机上的所有接口发送出去
D) 从 E1/0/4 接口发送出去
E) 从 E1/0/3 接口发送出去
F) 从 E1/0/1 接口发送出去
Solutions:
| Question # 1 Answer: A,B,C | Question # 2 Answer: D | Question # 3 Answer: B,C,D | Question # 4 Answer: D | Question # 5 Answer: B,D,E |
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Constructing Small - and Medium - Sized Enterprise Network
Constructing Small - and Medium - Sized Enterprise Network
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