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【单选题】
关于UNIX操作系统特性的描述中，正确的是______。A.
UNIX是一个单用户、多任务的操作系统，用户可运行多个进程
B.
UNIX本身由汇编语言编写，易读、易移植、运行速度快
C.
它提供了功能强大的Shell编程语言，但使用不够简捷
D.
它的树结构文件系统有良好的安全性和可维护性
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【单选题】Which is not a reason that Internet Service Providers prefer to use PPP over Ethernet (PPoE)?（）
A.
access control and billing can be done on a per-user, rather than a per-site basis
B.
supports Link Fragmentation and Interleaving
C.
provides the ability to connect a network of hosts over a simple bridging access device
D.
provides a consistent means of authenticating users (RADIUS for example)
【简答题】Ethernet is a means of implementing
which of the following network topologies?A. bus B. star C. ring D. Wifi
【简答题】The
Internet is a wide area network, or WAN, which is different from a LAN. In contrast to the
term Internet, local area networks are often
called Intranets, though sometimes this term refers to a bun...
【单选题】Ethernet is a means of implementing which of the following network topologies?
A.
Star
B.
WiFi
C.
Bus
【多选题】Which three of these statements about PPPoP are true？（）
A.
You must install PPPoP client software on all hosts that connects to the Ethernet segment this means that the access provider must maintain a CPE
B.
PPPoP can provide a host with access to a destination over Ethernet. You can have only one PPPoPsession per PVC
C.
PPPoP implementation is susceptible to broadcast storms and possible denial-of-service attacks
D.
You cannot use PPPoP with Cisco Service Selection Gateway
E.
Per-session accounting is possible， which allows the service provider to charge the subscribe based onsession time for various services offered. The service provider can also require a minimum access change
【简答题】比萨城的标志是位于罗马式大教堂后方右侧的_ 。
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