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
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生物膜的基本结构是()
A. 磷脂双层两侧各有蛋白质附着
B. 磷脂形成片层结构,蛋白质位于各个片层之间
C. 蛋白质为骨架,二层磷脂分别附着于蛋白质的两侧
D. 磷脂双层为骨架,蛋白质附着于表面或插入磷脂双层中
E. 由磷脂构成的微团
物理层常用的互联设备有哪些?()
A. 集线器
B. 网桥
C. 中继器
D. 路由器
E. 交换机