2022年01月17日来源:信管网 作者:cnitpm
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网络工程师每日一练试题内容(2022/1/16)
试题1: 从技术发展角度看,最早出现的IP电话工作方式是( ) 802.11g工作在全球通用的 (1) ISM频段,最高数据速率可达 (2) 。
(1)A、1GHz
B、2.4GHz
C、5GHz
D、10GHz
(2)A、1Mbps
B、11Mbps
C、54Mbps
D、100Mbps
IPv6的链路本地地址是在地址前缀1111 1110 10之后附加(18)形成的。
A.IPv4地址
B.MAC地址
C.主机名
D.随机产生的字符串
OSPF协议适用于4种网络。下面选项中,属于广播多址网络的是 (1) ,属于非广播多址网络的是 (2) 。
(1)A、Ethernet
B、PPP
C、Frame Relay
D、RARP
(2)A、Ethernet
B、PPP
C、Frame Relay
D、RARP
设信道带宽为4000Hz,调制为4种不同的码元,根据Nyquist定理,理想信道的数据速率为 ( 8) 。
A、10 kb/s
B、16 kb/s
C、24 kb/s
D、48 kb/s
不使用面向连接传输服务的应用层协议是 ( ) 。
A、SMTP
B、FTP
C、HTTP
D、SNMP
Without proper safeguards, every part of a network is vulnerable to a security breach or unauthorized activity from (1), competitors, or even employees. Many of the organizations that manage their own (2) network security and use the Internet for more than just sending/receiving e-mails experience a network (3)— and more than half of these companies do not even know they were attacked. Smaller (4) are often complacent, having gained a false sense of security. They usually react to the last virus or the most recent defacing of their website. But they are trapped in a situation where they do not have the necessary time and(5)to spend on security.
(1)A.intruders
B.terminals
C.hosts
D.users
(2)A.exterior
B.internal
C.centre
D.middle
(3)A.attack
B.collapse
C.breakdown
D.virus
(4)A.users
B.campuses
C.Companies
D.networks
(5)A.safeguards
B.businesses
C.experiences
D.Resources
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