A. point-to-pointB. broadcast multi-accessC. nonbroadca……

单项选择题The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.0 0.0.0.255 any What is the effect of this access list configuration?（）

A. permit all packets matching the first three octets of the source address to all destinations
B. permit all packet matching the last octet of the destination address and accept all source addresses
C. permit all packet matching the host bits in the source address to all destinations
D. permit all packet from the third subnet of the network address to all destinations

单项选择题The following access list below was applied outbound on the E0 interface connected to the 192.169.1.8 29 LAN: access-list 135 deny tcp 192.169.1.8 0.0.0.7 eq 20 any access-list 135 deny tcp 192.169.1.8 0.0.0.7 eq 21 any How will the above access lists affect traffic? （）

A. FTP traffic from 192.169.1.22 will be denied
B. No traffic, except for FTP traffic will be 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As a network administrator, you have been instructed to prevent all traffic originating on the LAN from entering the R2 router. Which the following command would implement the access list on the interface of the R2 router?（）

A. access-list 101 in
B. access-list 101 out
C. ip access-group 101 in
D. ip access-group 101 out

单项选择题A network administrator wants to add a line to an access list that will block only Telnet access by the hosts on subnet 192.168.1.128 28 to the server at 192.168.1.5. What command should be issued to accomplish this task?（）

A. access-list 101 deny tcp 192.168.1.128 0.0.0.15 192.168.1.5 0.0.0.0 eq 23 access-list 101 permit ip any any
B. access-list 101 deny tcp 192.168.1.128 0.0.0.240 192.168.1.5 0.0.0.0 eq 23 access-list 101 permit ip any any
C. access-list 1 deny tcp 192.168.1.128 0.0.0.255 192.168.1.5 0.0.0.0 eq 21 access-list 1 permit ip any any
D. access-list 1 deny tcp 192.168.1.128 0.0.0.15 host 192.168.1.5 eq 23 access-list 1 permit ip any any

单项选择题Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）

A. L2TP
B. IPsec
C. PPTP
D. RSA