【多选题】
为什么说可以通过提高链路带宽容量来提高网络的QoS___
A. 链路带宽的增加减小了拥塞发生的几率,从而减少了丢包的数量
B. 链路带宽的増加可以增加控制协议的可用带宽
C. 链路带宽的增加意味着更小的延迟和抖动
D. 链路带宽的增加可以支持更高的流量
查看试卷，进入试卷练习
微信扫一扫，开始刷题
相关试题
【多选题】
PQ+WFQ的优点有___
A. 不能有差别地对待优先级不同的报文
B. 可保证低时延业务得到及时调度
C. 实现按权重分配带宽
D. 实现根据用户自定义灵活分类报文的需求
【多选题】
可能会发生丢包的情况有___
A. 可能由于CPU繁忙,无法处理报文而导致丢包
B. 在传输过程发生丢包
C. 队列中发生丢包
D. 接收过程发生丢包
【多选题】
下面有关Qos中 Integrated Service与 RSVDPd的说法,不正确的是___
A. Integrate Service其实也就是RSVP
B. Integrate Service采用RSVP作为它的信令机制
C. RSVP是一个多用途的协议,除了 Integrate Service之外,RSVP还可用于其他领域
D. Integrate Service适合于在骨干网上大量应用
【多选题】
传统网络无法保证通信质量的原因有___
A. 无区别地对待所有报文
B. 依照报文到达时间的先后顺序分配转发所需要的资源
C. 无法保证关键业务的通信质量
D. 网络设备处理报文采用的策略是先入先出FTFO
【多选题】
流量监管与流量整形的区别是___
A. 流量整形对报文着色
B. 流量监管引入时延和抖动,需要较多的缓冲资源缓存报文
C. 流量整形引入时延和抖动,需要较多的缓冲资源缓存报文
D. 流量监管对报文着色
【多选题】
关于VRRP快速切换的描述错误的是___
A. 使用ⅤRRP监视 BFD session或者EFM功能,在 BFD session或者是EFM会话状态改变后通知VRRP模块,实现VRRP快速切换
B. 一个VRRP备份组不能同时监视 peer BFD, link BFD和 nonmal BFD
C. VRRP备份组监视普通BFD时,当BFD状态变化时,通过修改备份组优先级改变主备状态,被监视的BFD会话状态恢复时,路由器在备份组中的优先级将恢复原来的值
D. 同时配置监视多个BFD的情况下,各个配置互相关联,可能会有影响
【多选题】
在DHCP协议运行过程中,哪些情况会用DHCP REQUEST报文?___
A. 客户端初始化后,发送广播的DHCP REQUEST报文来回应服务器的DHCP OFFER报文。
B. 当客户端发现服务器分配给它的IP地址发生冲突时会通过发送此报文来通知服务器,并且会重新向服务器申请地址。
C. 当客户端已经和某个IP地址绑定后,发送
D. HCP REQUEST报文来更新地址的租约
【多选题】
访客接入有哪些特征?___
A. 访客和员工的访问权限相同
B. 访客自带设备接入网络
C. 访客言论、行为不受控
D. 访客访间企业网络范围不受控
【多选题】
关于VRRP的负载分担描述,正确的是:___
A. 在路由器的一个接口上可以创建多个虚拟路由器,使得该路由器可以在一个虚拟路由器中作为 Master路由器,同时在其他的虚拟路由器中作为Backup路由器
B. 负载分担方式是指多台路由器同时承担业务,因此负载分担方式需要两个或者两个以上的虚拟路由器。
C. 负载分担方式是指建立两个或更多备份组,多台路由器同时承载业务
D. 在配置优先级时,三个虚拟路由器的ⅤRRP master可以在不同路由器上
【多选题】
关于VRRP快速切换的描述,错误的是:___
A. 一个VRRP备份组不能同时监视Peer BFD、Link BFD和 Normal BFD
B. VRRP备份组监视普通BFD时,当BFD状态变化时,会通过修改备份组优先级改变主备状态,当被监视的BFD会话状态恢复时,路由器在备份组中的优先级就会恢复成原来的值。
C. 使用VRRP监视BFD session或者EFM功能,在 BFD session或者EFM会话状态改变后会通知ⅤRRP模块,实现VRRP快速切换
D. 若同时配置监视多个BFD,那么各个配置问相互关联,并可能会有影响
【判断题】
IP报文中用Tos字段进行QOS标记，Tos字段中是使用前6bit来标记DSCP的
【判断题】
传统的丢包策略采用尾部丢弃(Tail-Drop)的方法，这种丢弃方法会导致TCP全局同步现场
【判断题】
流镜像分为本地流镜像和远程流镜两种方式
【判断题】
MPLS， 又称为多协议标签交换技术，可以说MPLS技术的核心是标签交换
【判断题】
VRRP的IP地址和虚拟IP地址可以相同
【判断题】
lntServ模型，在应用程序发送报文前，需要向网络申请预留资源
【判断题】
NAT技术可以通过对数据加密来实现数据安全传输
【判断题】
单包攻击指攻击者控制僵尸主机，向目标网络发送大量的攻击报文，造成被攻击网络链路拥塞，系统资源耗尽
【判断题】
同一安全区域的主机和服务器之间互访时，不需要使用NAT进行地址转换
【判断题】
快速检测技术可以尽早地检测到与相邻设备间的通信故障，以便系统能够及时采取措施，保证业务不中断
【判断题】
47复杂流分类是指根据五元组<源目的地址.源／目的端口号.协议类型>等信息对报文进行分类，通常应用在网络的核心位置
【判断题】
当两台优先级相同的设备同时竞争Master角色时，则IP地址较小的接口所在的设备应当被选为Mater设备
【判断题】
在防火墙上Ping防火墙某接口PI地址时，这些报文将交给防火墙内部模块进行处理，并不被转发出去
【判断题】
65VPN模型主要分为两种，一种是Overlay VPN，别一种是Peer-to-Peer VPN
【判断题】
67如果防火墙的两个接口被划分到同一区域，那么两目的端门暗的数据包流动也必须经过域间包过滤处理过程
【判断题】
eSight单服务器模式，最多只允许一个用户登录，当其他用户登录时，会提示已有用户登录
【判断题】
抖动是由于属于同一个流的数据包的端到端时延不相等造成的
【判断题】
SDN控制器可以根据网络状态智能调整流量路径，以达到提升整网吞吐的目的
【判断题】
BFD机制使用TCP建立连接，其目的端口号为3784
【判断题】
VXLAN用户可通过VXLAN接口访问Internet
【判断题】
使用eSight初始添加设备后，拓扑元素的排列都是随机的，不能体现出实际的网络结构，所以还需要根据实际的网络组网进行位置调整或选择拓扑提供的自动布局功能
【判断题】
118当虚拟路由器回应ARP请求时，使用主路由器的真实MAC地址
【判断题】
ASPF技术使得防火墙能够支持如FTP等多通道协议，同时还可以对复杂的应用制定相应的安全策略
【判断题】
流量分类是按照一定的规则来识别符合某类特征的报文，而且特征不同的报文可以享受到不同的服务。帮由于分类规则按照参考信息的不同，流量分类可以分为简单流分类和复杂流分类
【判断题】
140通常在配置QoS中的Diff-Serv时，边界路由器会通过报文的源地址和目的地址等对报文进行分类，对不开的报文设置不同的IP优先级，而其他路由器只需要根据IP优先来对报文进行识别即可
【判断题】
VXLAN技术就是为了建立一个跨DC的二层网络
【判断题】
PQ的分类机制支持使用标准或扩展的IP访问列表
推荐试题
【单选题】
The following except are guaranteed in the Bill of Rights.
A. A. freedom of religion
B. B. the right to get into people’s house by police
C. C. freedom of speech and of press
D. D. the right to own one’s weapon if one wishes
【单选题】
The Bill of Rights .
A. A. defines the rights of Congress and the rights of the President
B. B. guarantees citizens of the United States specific individual rights and freedoms
C. C. is part of the Declaration of Independence
D. D. has no relationship with the Constitution
【单选题】
The Constitution of the United States .
A. A. gives the most power to Congress
B. B. gives the most power to the President
C. C. tries to give each branch enough power to balance the others
D. D. gives the most power to the Supreme Court
【单选题】
The U. S. Constitution came into effect in .
A. A. 1787
B. B. 1789
C. C. 1791
D. D. 1793
【单选题】
The Vietnam War was a long-time suffering for Americans, and it continued throughout the terms of Presidents .
A. A. Johnson, Nixon and Ford
B. B. Truman, Eisenhower and Kennedy
C. C. Kennedy, Johnson and Nixon
D. D. Eisenhower, Kennedy and Johnson
【单选题】
President applied New Deal to deal with the problems of the Great Depression.
A. A. Wilson
B. B. Truman
C. C. Roosevelt
D. D. Kennedy
【单选题】
The policy of the United States was at the beginning of the two world wars.
A. A. neutrality
B. B. full involvement
C. C. partial involvement
D. D. appeasement
【单选题】
Abraham Lincoln issued to grant freedom to all slaves.
A. A. Declaration of Independence
B. B. Constitution
C. C. Emancipation Proclamation
D. D. Bill of Rights
【单选题】
In May 1775, was held in Philadelphia and began to assume the functions of a national government.
A. A. the First Continental Congress
B. B. the Second Continental Congress
C. C. the Boston Tea Party
D. D. the Congress of Confederation
【单选题】
The first shots of the American dependence were fired in .
A. A. Concord
B. B. Lexington
C. C. Philadelphia
D. D. Boston
【单选题】
“No taxation without representation” was the rallying slogan of .
A. A. the settlers of Virginia
B. B. the people of Pennsylvania
C. C. the colonists in New England
D. D. the people of the 13 colonies
【单选题】
The Seven Years’ War occurred between the .
A. A. French and American Indians
B. B. French and Spaniards
C. C. French and British
D. D. British and American Indians
【单选题】
Pilgrim Fathers are a group of who came to America to avoid persecution in England.
A. A. Protestants
B. B. Puritans
C. C. Catholics
D. D. Christians
【单选题】
The first successful English colony in North America was founded at in .
A. A. Jamestown, Louisiana
B. B. Boston, Massachusetts
C. C. Jamestown, Virginia
D. D. Plymouth, Georgia
【单选题】
The characteristic of dominant American culture is .
A. A. English-speaking, northern European, Roman Catholic and middle-class
B. B. English-speaking, western European, Roman Catholic and upper-class
C. C. English-speaking, northern European, Protestant and upper-class
D. D. English-speaking, western European, Protestant and middle-class
【单选题】
The ImmiWar of Ingrants Act of 1924 restricted the further immigration into the United States, particularly from .
A. A. Europe
B. B. Asia
C. C. Africa
D. D. South America
【单选题】
The largest minority in the United States is the .
A. A. Pacific Islanders
B. B. Blacks
C. C. Native Americans
D. D. Asians
【单选题】
The native Alaskan population includes the following except the .
A. A. Indians
B. B. Eskimos
C. C. Aleuts
D. D. Blacks
【单选题】
is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
A. A. Yellowstone National Park
B. B. The Grand Canyon
C. C. Niagara Falls
D. D. The Great Salt Lake
【单选题】
Some of the world famous universities like Harvard, Yale and MIT are located .
A. A. in the South
B. B. along the Pacific Coast
C. C. in New England
D. D. in the Midwest
【单选题】
The largest river in the U. S. is .
A. A. the Missouri River
B. B. the Mississippi River
C. C. the Ohio River
D. D. the Colorado River
【单选题】
The U. S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
A. A. northern, east, west
B. B. central, east, west
C. C. southern, west, east
D. D. western, east, west
【单选题】
The state of is the largest in area of all the states.
A. A. Alaska
B. B. Hawaii
C. C. Texas
D. D. Florid
【单选题】
The United States has states on the continent.
A. A. 50
B. B. 49
C. C. 48
D. D. 35
【单选题】
Waiting for Godot is written by .
A. A. Samuel Beckett
B. B. George Orwell
C. C. William Golding
D. D. D. H. Lawrence
【单选题】
Of the following writers, is NOT a Nobel Prize winner.
A. A. Samuel Beckett
B. B. James Joyce
C. C. William Golding
D. D. V. S. Naipaul
【单选题】
Of the following statements, is NOT correct about Virginia Woolf.
A. A. She was a central figure of the “Bloomsbury Group”.
B. B. She experimented with stream of consciousness.
C. C. She was an influential feminist.
D. D. Her masterpiece was The Rainbow.
【单选题】
Of the following books, was NOT written by Thomas Hardy.
A. A. Jude the Obscure
B. B. Tess of the D’Urbervilles
C. C. Adam Bede
D. D. The Return of the Native
【单选题】
is NOT included in the modernist group.
A. A. Oscar Wild
B. B. Virginia Woolf
C. C. William Butler Yeats
D. D. T. S. Eliot
【单选题】
Of the following statements, is NOT correct in terms of Neo-Romanticism.
A. A. It prevailed at the end of the 19th century.
B. B. The writers were dissatisfied with the social reality.
C. C. The writers believed in “Art for Art’s Sake”.
D. D. Treasure Island was a representative work.
【单选题】
is a representative of English Critical Realism at the turn of the 19th century.
A. A. Robert Louis Stevenson
B. B. John Milton
C. Joseph Conrad
D. D. Thomas Hardy
【单选题】
Of Dickens’ novels, is considered autobiographical.
A. A. A Tale of Two Cities
B. B. David Copperfield
C. C. Oliver Twist
D. D. Great Expectations
【单选题】
is viewed as Romantic poetry’s “Declaration of Independence.”
A. A. “I Wondered Lonely as a Cloud”
B. B. Don Juan
C. C. “Preface to Lyrical Ballads”
D. D. Prometheus Unbound
【单选题】
The most significant achievement of the English Renaissance is .
A. A. poetry
B. B. drama
C. C. novel
D. D. pamphlet
【单选题】
The following Christmas traditions are particularly British except .
A. A. Trooping the Color
B. B. Queen’s Christmas message
C. C. Boxing Day
D. D. Christmas pantomime
【单选题】
Of the following, is NOT a common feature of all the British holidays.
A. A. families getting together
B. B. friends exchanging good wishes
C. C. friends enjoying each other’s company
D. D. families traveling overseas
【单选题】
is Britain’s top pay television provider.
A. A. BSB
B. B. SkyTV
C. C. BBC
D. D. BSkyB
【单选题】
Life on Earth is a kind of program produced by the BBC and is popular among 500 million viewers worldwide.
A. A. feature
B. B. drama
C. C. documentary
D. D. soap opera
【单选题】
Among Britain’s quality press, the following newspapers are regarded as the “Big Three” with the exception of .
A. A. The Times
B. B. The Guardian
C. C. The Observer
D. D. The Daily Telegraph
【单选题】
To be admitted to the Open University, one need .
A. A. some educational qualifications
B. B. no educational qualifications
C. C. General Certificate of Education-Advanced
D. D. General National Vocational Qualifications
