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H3CSE-RS-NSO Sample Questions:

1. 在 Router1 和 Router3 之间创建 GRE 隧道,三台路由器配置分别为:
Router1:
[Router1] interface Serial 0/2/0
[Router1-Serial0/2/O] ip address 10.1.1.1 24
[Router1] interface loopback 0
[Router1-LoopBackO] ip address l.1.1.1 32
[Router1] interface Tunnel 0
[Router1-TunnelO] source 10.1.1.1
[Router1-TunnelO] destination 20.1.1.2
[Router1-TunnelO] ip address 100.1.1.1 24
[Router1] ospf
[Router1-ospf-l] area 0
[Router1-ospf-l-area-0.0.0.0] network 10.1.1.1 0.0.0.255
[Router1-ospf-l-area-0.0.0.0] network l.1.1.1 0.0.0.0
Router2:
[Router2] interface Serial 0/2/0
[Router2-Serial0/2/O] ip address 10.1.1.2 24
[Router2] interface Serial 0/2/1
[Router2-Serial0/2/1] ip address 20.1.1.1 24
[Router2] ospf
[Router2-ospf-l] area 0
[Router2-ospf-l-area-0.0.0.0] network 10.1.1.2 0.0.0.255
[Router2-ospf-l-area-0.0.0.0] network 20.1.1.1 0.0.0.255
Router3 :
[Router3] interface Serial 0/2/0
[Router3-Serial0/2/O] ip address 20.1.1.2 24
[Router3-Serial0/2/O] quit
[Router3] interface loopback 0
[Router3-Loop Back0] ip address 3.3.3.3 32
[Router3] interface Tunnel 0
[Router3-Tunnel0] source 20.1.1.2
[Router3-Tunnel0] destination 10.1.1.1
[Router3-Tunnel0] ip address 100.1.1.2
[Router3] ospf
[Router3-ospf-l] area 0
[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255
[Router3-ospf-l-area-0.0.0.0] network 3.3.3.30.0.0.0
在 Router 上使用命令 ping-a 1.1.1.1 3.3.3.3 ,检查连通性, l00% 收到 icmp 回包。
上进过程中,以下对各路由器对数据包的处理过程酌描述,正确的是。（选择一项或多项)

A) Router3 进行 ICMP Echo reply 报文 GRE 封装
B) Router1 进行 IP 数据包转发
C) Router3 进行数据包转发
D) Router1 进行 ICMP Echo Request 报文 GRE 解封装

2. 四台路由器 R1 、 R2 、 R3 和 R4 顺序相连, R1 和 R4 上创建 Loopback0 接口,接口地址分别为 1.1.1.1 和 4444 ,四台设备分别配置静态路由协议,保证 R1 和 R4 的 Loopback0 地址路由可达, R1 和 R4 间建立 GRE Tunnel ,查看 R1 上 Tunnel 接口信息如下:
[R1] displa interface Tunnel O
Tunnelo current state: UP
Tunnelo current statle: UP
Line protocol current state: UP
D. escription: Tunnel 0 Interface
The Maximum transmit Unit is 1476
Internet Addess is 10.0.0.1/30 Primar .Encapsulation isTUNNEL aggregation ID not set
Tunnel source l.1.1.1 destination 4.4.4.4
Tunnel keeepalive disable
Tunnel protocol/transport GRE/IP.GRE key disable
Checksumming of GRE packets disabled
Last 300 seconds input: . 2 btes/secl 0 packet/sec.Last 300 seconds output : . .2 bytes/sec, O packets/sec .15.packets input 840bytes.0. input error
27packets output, 1248btes
00utput error
此时,若中断 R2 和 R3 之间链路,则下列说法正确的是

A) R4 的 Tunnel 接口 IP 地址应为 10.0.0.2
B) R1 上的 -Tunnel 接口保持 UP 状态
C) R4 的 Tunnel 接口的源 IP 为 4.4.4.4 ,目的 IP 为 1.1.1.1
D) R1 上的 Tunnel 接口状态 DOWN

3. 下列 VPN 技术中,属于第二层 VPN 的有。（选择一项或多项)

A) IPSec VPN
B) GRE VPN
C) VLL
D) VPLS

4. 对于畸形报文防御说法正确的有。

A) ping of death 攻击是利用超大尺寸的报文进行攻击的
B) 畸形 TCP 报文攻击是通过将 TCP 的标志设置为特定数值的报文进行攻击的
C) 要防御畸形报文攻击,需要对每一种攻击的特点进行针对性防御
D) Teardrop 类的攻击利用 UDP 包重组时重叠移动的漏洞来进行攻击的

5. 下列哪些选项是合法的 SIP URI?

A) sip : [email protected]
B) 以上都不对
C) sip : [email protected] : 5068
D) sip : [email protected]

Solutions: