单项选择题
A network administrator receives an error message while tring to configure the Ethernet interface of a router with IP address 10.24.24.24/29.which statement explains the reason for this issue?（）
A.The address is a broadcast address
B.The Ehernet interface is faulty
C.VLSM-capable routing protocols must be enable first on the router.
D.This address is a network address.
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单项选择题
Th efollowing access list below was applied outbound on the E0 interface connected to the 192.169.1.8/29LAN： access-list 135 deny tcp 192.169.1.80.0.0.7 eq 20 any access-list 135 deny tcp 192.169.1.80.0.0.7 e q21 any How will the above access lists affect traffic？（）
A.FTP traffic from 192.169.1.22 wil lbe denied
B.Not raffic，except for FTP traffic wil lbe allowed to exit E0
C.FTP traffic from 192.169.1.9 to any host will be denied
D.All traffic exiting E0 will be denied
E.All FTP traffic to network 192.169.1.9/29 will be denied -
单项选择题
一位网络管理员在进行链路连通性检查时，发现CiscoCatalyst系列交换机上的LED灯，在绿色和琥珀色之间不停变化。以上现象是因为（）。
A.这个端口存在问题
B.这个端口被管理性的禁止。
C.这个端口被生成树协议阻塞
D.这个端口的活动链路上有流量。 -
单项选择题
在OSPF点到点链路中，Hello包是发往以下那个地址？（）
A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255
