题目内容

下列关于瞳孔对光反射的描述,正确的是:

A. 发生在被视物体由远移近时
B. 光照一侧眼,同侧眼瞳孔散大
C. 光照一侧眼,对侧眼瞳孔散大
D. 生理意义是减少球面像差和色像差
E. 临床上用于检查中脑是否受损

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视近物时,眼的调节包括:

A. 睫状肌收缩,瞳孔缩小
B. 睫状肌放松,瞳孔缩小
C. 睫状肌放松,瞳孔散大
D. 睫状肌收缩,瞳孔散大
E. 睫状肌不变,瞳孔不变

三台路由器如图所示,在Routerl和Router3之间创建GRE隧道,三台路由器配置命令分别为: Routerl: [Routerl]interface Serial 0/2/0 [Routerl-Serial0/2/O]ip address 10.1.1.1 24 [Routerl]interface loopback 0 [Routerl-LoopBackO]ip address l.1.1.1 32 [Routerl]interface Tunnel 0 [Routerl-TunnelO]source 10.1.1.1 [Routerl-TunnelO]destination 20.1.1.2 [Routerl-TunnelO]ip address 100.1.1.1 24 [Routerl]ospf [Routerl-ospf-l]area 0 [Routerl-ospf-l-area-0.0.0.0] network 1 0.1 .1 .1 0.0.0.255 [Routerl]ip route-static 3.3.3.3 32 100.1.1.2 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]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]ip route-static l.1.1.1 32 100.1.1.1 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. Routerl进行ICMP Echo Request报文GRE解封装
B. Routerl进行ICMP Echo reply 报文GRE封装
C. Router2进行ICMP Echo Request报文GRE解封装
D. Router3进行ICMP Echo reply 报文GRE封装

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 4.4.4.4,四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: UPTunnelo current statle: UP Line protocol current state: UP Description: Tunnel 0 Interface The Maximum transmit Unit is 1476 Internet Addess is 10.1.1.1/30 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 此时,若中断R2和R3之间链路,则下列说法正确的是____

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

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 4.4.4.4,四台设备分别配置动态路由协议,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 0 Tunnelo current state: UPLine protocol current state: UP Description: Tunnelo Interface The Maximum Transmit Unit is 1476 Internet Address is 10.0.0.1/30 Primar Encapsulation is TUNNEL, aggregation ID not set Tunnel source l.1.1.1, destination 4.4.4.4 Tunnel keepalive disable Tunnel protocol/transport GRE/IP GRE ke disabled Checksumming of GRE packets disabled 此时,若中断R2和R3之间链路,则下列说法正确的是

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