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| Section | Objectives |
|---|---|
| IP Multicast | - Multicast VLAN
|
| Spanning Tree and Redundancy Protocols | - High Availability Technologies
|
| VLAN and Switching Technologies | - VLAN Concepts
|
| Campus Network Fundamentals | - Campus Network Architecture
|
| Campus Network Security | - Security Overview
|
1. 关于 H3C 交换机的生成树端口开销配置,下列说法正确的有
A) 默认情况下,端口开销值越大,表明端口带宽越小
B) 如果不同厂商的交换机互联,应当尽量配置各交换机遵循相同的端口开销标准,否则可能会导致生成树计算结果偏离网络设计初衷
C) H3C 交换机默认遵循的生成树端口开销标准为 legacy
D) H3C 交换机支持三种端口开销标准,分别为 dot1d-1998 、 dot11 和 legacy ,通过命令 stp pathcost-standard 可以切换遵循的端口开销标准
2. 在如图所示的交换网络中,交换机 SWA 上设置 VLAN10 为 Super VLAN , VLAN2 和 VLAN3 为 VLAN10 的 Sub VLAN ,端口 Ethernet1/0/3 为 Trunk 端口, PVID 为 VLAN1 ,允许所有 VLAN 通过;交换机 SWB 上创建 VLAN2~VLAN20 ,端口 Ethernet1/0/4 为 Trunk 端口, PVID 为 VLAN1 ,允许所有 VLAN 通过 SWA 上査看 Ethernet 1/0/3 端口信息,下面显示正确的为
A) [SWA]display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ...... PVID: 1 Mdi type: auto Link delay is 0(sec) Port link-type: trunk VLAN passing: 1 (default vlan), 2-3,10 VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q
B) [SWA]display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ...... PVID: 1 Mdi type: auto Link delay is 0(sec) Port link-type: trunk VLAN passing: 1 (default vlan), 2 VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q
C) [SWA]display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ...... PVID: 1 Mdi type: auto Link delay is 0(sec) Port link-type: trunk VLAN passing: 1 (default vlan), 2 VLAN permitted: 1 (default vlan), 2-9, 11-4094 Trunk port encapsulation: IEEE 802.1q
D) [SWA]display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ...... PVID: 1 Mdi type: auto Link delay is 0(sec) Port link-type: trunk VLAN passing: 1 (default vlan), 2-3 VLAN permitted: 1 (default vlan), 2-9, 11-4094 Trunk port encapsulation: IEEE 802.1q
3. 如图所示组网中, RT1 、 RT2 和 RT3 之间运行 PIM SM 协议, RP 为 1.1.1.1 ,且有下游接收者 RT3 上连有组播源,査看 RT3 单播路由表如下:
[RT3]display ip routing-table
Routing Tables: Public
Destinations : 10 Routes : 10
Destination/MaskProtoPreCost NextHop Interface
1.1.1.1/320SPF 10 1562 192.168.0.1 S0/2/0
127.0.0.0/8 Direct 00127.0.0.1 InLoopO
127.0.0.1/32Direct 00127.0.0.1 InLoopO
192.168.0.0/30Direct 00192.168.0.2 S0/2/0
192.168.0.1/32Direct 00192.168.0.1 S0/2/0
192.168.0.2/32Direct 00127.0.0.1 InLoopO
192.168.1.0/300SPF 10 3124 192.168.2.1 so/2/1
192.168.2.0/30Direct 00192.168.2.2 so/2/1
192.168.2.1/32Direct 00192.168.2.1 so/2/1
192.168.2.2/32Direct 00127.0.0.1 InLoopO
那么,当 RP 发送注册停止消息后,下列哪些路由器上存在( S , G )表项 ?
A) RT3
B) RT1
C) RT2
4. 关于 MSTP 的 BPDU 格式,说法正确的有
A) 计算 CST 仅需要 RSTBPDU 字段的值即可
B) MSTP 的 BPDU 由 RSTBPDU 字段和 MST 专有字段组成
C) 如果将 MST 域看作逻辑上运行 RSTP 的交换机,则 CIST 域根 ID 即相当于该 RSTP 交换机的指定桥 ID ,通常该 ID 为 MST 域内值最小的桥 ID
D) 如果将 MST 域看作逻辑上运行 RSTP 的交换机,则 CIST 外部路径开销即相当于该 RSTP 交换机的根路径开销
5. 关于 MSTP 的基本概念,说法正确的有
A) IST 是 MST 域内的一棵生成树, IST 对应的实例号为 0
B) CST 是指域之间的一棵生成树,它是 MST 域之间运行 STP/RSTP 得到的
C) 默认情况 MST 域内的所有 VLAN 都映射到 IST
D) CST 运行时,将 MST 域视为逻辑上的一台交换机, CST 的根桥为总根所属的域
Solutions:
| Question # 1 Answer: A,B,C,D | Question # 2 Answer: D | Question # 3 Answer: A,B | Question # 4 Answer: A,B,D | Question # 5 Answer: A,B,C,D |
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