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Exam : Huawei GB0-360
Title : Designing Enterprise-level Networks

1. 进行网络需求分析第一步是收集用户需求，以下关于需求来源说法正确的是（ ）
A. 需求的来源可能来自国家或特定行业的政策
B. 决策者的思路对网络需求有重要影响
C. 历史资料
D. 可以通过与用户技术人员的沟通获得需求信息体
Answer: ABCD

2. 不同的网络计算平台对网络性能和功能的需求是不一样的。可从以下哪些方面评价计算平台的性能（ ）
A. 处理器性能
B. 内存
C. 操作系统
D. 网络配置
Answer: ABCD

3. 网络设计人员通过与用户群交流，获取用户对网络的需求信息。这中间要注意以下那些环节（ ）
A. 了解用户人员组织结构，与适当的人员进行交流
B. 区分哪些用户需求由用户完成，哪些在设计中完成
C. 列出对网络的性能需求
D. 得到对网络投资的数据
Answer: ABCD

4. 在收集网络中大型机的性能需求时，可能考虑以下哪些问题（ ）
A. 备份要求
B. 安全性
C. 可利用率
D. 数据库系统
Answer: ABCD

5. 不同用户对网络的需求是不一样的，以下不属于需求分析阶段的是（ ）
A. 明确用户对网络的投资规模
B. 了解用户目前网络运行情况
C. 明确网络需要解决的问题
D. 确定网络的拓扑结构
Answer: D

6. 在大多数网络设计中存在的一对主要矛盾是（ ），正确的理解它，对网络设计性能的提高非常有帮助。
A. 网络安全性和实时性之间的矛盾
B. 成本和网络性能之间的矛盾
C. 投资规模和网络未来增长之间的矛盾
D. 网络可靠性和响应时间之间的矛盾
Answer: B

7. 以下哪些因素会影响网络的可伸缩性（ ）
A. 公司人员的变化
B. 远程办公的需求
C. 移动办公的需求
D. 业务的变化
Answer: ABCD

8. 在构建网络时，需要了解网络采用的协议体系。由 IBM 公司 70 年代开发的网络体系结构（ ），普遍应用于金融网络
A. TCP/IP
B. IPX
C. SNA
D. AppleTalk
Answer: C

9. 网络的安全需求可以说是一个网络管理的问题，在网络设计中对任何数据流设计实施相同的安全策略说法是否正确（ ）
T. True
F. False
Answer: F

10. 网络的生命周期不包括网络的维护阶段说法是否正确（ ）
T. True
F. False
Answer: F

11. 以下属于企业网络系统构成元素的有（ ）
A. 操作系统
B. PC 机
C. 路由器
D. 以太网交换机
Answer: ABCD

12. 用户对网络的需求通常包括以下（ ）部分。
A. 物理拓扑结构
B. 网络协议
C. 安全需求
D. 网络设备
E. 广域网连接
Answer: ABCDE

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Exam : Huawei SU0-123
Title : Huawei Certified Datacom Professional-Building IP Telecom Network

1. VRP上使用display mpls te tunnel-interface Tunnel 0 命令查看隧道状态为down，以下可能的故障原因是：
A. 该隧道路径上的所有路由器是否都启动了mpls te。
B. 该隧道路径上的所有路由器是否都启动mpls rsvp-te。
C. 该隧道路径上的所有路由器是否都启动了mpls te cspf。
D. 该隧道起点路由器上是否将流量引入到隧道。
Answer: ABC

2. 以下关于基于接口的标签空间描述不正确的是
A. LSR为一个目的地址只分配一个标签
B. 一台LSR的入标签不可能相同
C. 和基于平台的标签空间相比，具有更高的安全性
D. 当LSR收到带标签的报文，只检查入标签进行转发而并不检查入接口
Answer: ABD

3. 以下哪个状态是LDP Session成功建立的标志
A. INITIALIZED
B. OPENREC
C. OPENSENT
D. OPERATIONAL
Answer: D

4. 以下哪条命令用于Egress节点向倒数第二跳分配显式空标签，值为0 ?
A. label advertise explicit-null
B. label advertise implicit-null
C. label advertise non-null
D. label advertise total
Answer: A

5. MPLS BGP VPN中，当MPLS VPN用户路由转换为VPNv4路由传递时，携带哪种Route Target？
A. Export RT
B. Implied RT
C. Import RT
D. Extended RT
Answer: A

6. 一个OSPF进程可以属于多个VPN-instance。
A. True
B. False
Answer: B

7. 关于MPLS TE的实现方式，以下说法正确的是
A. 目前主流的MPLS TE实现方式包括RSVP-TE和CR LDP-TE。
B. RSVP-TE技术较为复杂，扩展性较差。
C. CR LDP-TE技术比较简单，扩展性较好。
D. 因为CR LDP-TE技术的优点，所以是使用最多的MPLS TE实现方式。
Answer: ABC

8. MPLS BGP VPN OSPF超级Backbone实现中，MP-BGP传递VPNv4路由信息时携带以下哪些BGP扩展属性？
A. OSPF Domain Identifier Extended Community
B. OSPF Route Type Extended Community
C. OSPF Router ID Extended Community
D. Route Distinguisher
E. Route Target
Answer: ABCE

9. LDP PDU头部的长度为（）个字节
A. 10
B. 20
C. 40
D. 10～40
Answer: A

10. 在VRP5中LDP环路检测的路径向量
A. 缺省值为16
B. 缺省值为15
C. 缺省值为32
D. 缺省值为32
Answer: C

11. 传统IP转发在流量工程方面的描述正确的有
A. 考虑了带宽、链路属性等因素
B. 基于IGP面向目的地址的转发
C. 可以根据来源进行控制流量转发
D. 是面向连接的，可以实现显式路径
Answer: B

12. 在隧道接口视图下可以使用命令mpls te igp metric改变TE隧道的IGP度量值，如果使用绝对度量absolute，则TE隧道的度量值就是配置的值。
A. True
B. False
Answer: A

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Exam : Huawei GB0-280
Title : Huawei(r) Constructing Enterprise-level Routing Networks

1. 查看OSPF区域ABR、ASBR的信息，可以使用（　 　）
A. Display ospf
B. Display ospf error
C. Display ospf interface
D. Display ospf peer
Answer: A

2. 对于route-policy的某个节点，路由信息依次匹配各if-match子句，通过某一条if-match子句的匹配，就意味着通过该route-policy过滤。
T. True
F. False
Answer: F

3. 对于OSPF协议中路由器之间的邻接关系（adjacency），下面说法正确的有（）
A. 两台路由器，只要是双向的邻居关系（相互收到了对方的Hello报文），就自动成为了邻接关系
B. 两台路由器如果是互为邻接关系，则它们之间的承载网络（underlying network）类型有可能是　 point-to-point
C. 两台路由器如果是互为邻接关系，则它们之间的承载网络（underlying network）类型有可能是　 Point-to-MultiPoint
D. 两台路由器如果是互为邻接关系，而且它们之间的承载网络（underlying network）类型是Broadcast，则必然有一台路由器是DR或者是BDR
E. 只有两台路由器是互为邻接关系，它们之间才交换LSA信息
Answer: BCDE

4. 在BGP协议中，对环路的避免的方法有（　 　）
A. 在路由的origin　属性中记录路由的起源
B. 在路由的AS-Path　属性中记录所有途经的　 AS
C. 在路由的Next-Hop　属性中纪录路由的下一跳
D. 在路由的MED属性中影响另一AS的出口选择
Answer: B

5. 路由协议间相互引入对方的路由信息称为双向引入，为了防止双向引入时产生路由环路，可以采取
A. 不允许在多边界点配置双向引入
B. 使用filter-policy import
C. 使用filter-policy export
D. 使用防火墙
Answer: B

6. 下列关于骨干区域的描述，正确的是（　 ）
A. 骨干区域号的areaid是0.0.0.0
B. 所有区域必须与骨干区域相连
C. 骨干区域之间可以是不连通的
D. 每个区域边界路由器ABR连接的区域中至少有一个是骨干区域
Answer: ABD

7. 两台运行OSPF　协议的路由器正在进行链路状态数据库的同步，从其中一台上查看邻居状态机，已经达到FULL状态。则可以推断出如下结论：此时在另一台路由器查看邻居状态机，应该同样达到　 FULL　状态。( )
T. True
F. False
Answer: F

8. 在BGP路由协议中，公认团体属性NOEXPORT的作用是（　 ）
A. 传递这一团体属性值的路由不应被通告给一个联盟之外的对等体
B. 传递这一团体属性值的路由，在收到后，不应通告给任何　 BGP　的对等体
C. 传递这一团体属性值的路由，在收到后，不应通告给任何　 EBGP　的对等体
D. 以上都不对
Answer: A

9. 　每个RADIUS　报文中可以携带（　 　）个属性。
A. 必须　 1　个
B. 必须　 2　个
C. 必须　 3　个
D. 可以多个
Answer: D

10. RTA向RTB通告一条从EBGP　相邻体学到的路由1.1.1.0/24， RTA和RTB在同AS中，一其属性为
　 local preference:100
　 MED: 100
　 AS_PATH: 200
　 Origine : EGP
　 Next_hop :88.8.8.1/16
　 RTB接收到的路由1.1.1.0/24的属性为（　 　）
A. Local preference:空, MED: 100, AS_PATH: 200 100 ,Origine :EGP, next_hop: 10.110.20.1/16
B. Local preference:100, MED: 100, AS_PATH: 200 ,Origine :EGP, next_hop: 88.8.8.1/16
C. Local preference:100, MED:空, AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16
D. Local preference:空, MED: 0, AS_PATH: 100 200, Origine :EGP, next_hop: 88.8.8.1/16Answer: B
10.路由协议间相互引入对方的路由信息称为双向引入，为了防止双向引入时产生路由环路，可以采取
A. 不允许在多边界点配置双向引入
B. 使用filter-policy import
C. 使用filter-policy export
D. 使用防火墙
Answer: B

11. 下面有关BGP协议描述，错误的是（）
A. BGP　是一个很健壮的路由协议
B. BGP　可以用来检测路由环路
C. BGP　无法聚合同类路由
D. BGP　是由　 EGP　继承而来的
Answer: C

12. BGP的团体是一组有公共性质的目的地。一个团体限于一个网络或一个自治系统（　）
T. True
F. False
Answer: F

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Exam : Huawei GB0-320
Title : Huawei(r) Constructing Enterprise-level Switching Networks

1. IEEE803把以太网链路层分成两个子层 , 分别是（ ）
A. 物理子层
B. MAC子层
C. LLC子层
D. IP子层
Answer: BC

2. 多层交换可以依据如下信息进行交换（）
A. 源MAC地址和目的MAC地址
B. 源IP地址和目的IP地址
C. 地址源端口和目的端口
D. IP包协议字段
Answer: ABCD

3. 以下几种以太网标准中支持速率自协商的有
A. 10BASE-T
B. 100BASE-TX
C. 1000BASE-LX
D. 1000BASE-SX
Answer: AB

4. 以下关于端口汇聚的说法正确的是
A.可以应用在交换机和交换机的连接
B.可以应用在交换机和路由器的连接
C.不能应用在高速服务器之间的连接
D.不能应用在交换机和高速服务器之间的连接
Answer: AB

5. 如果需要设置Quidway S3526以太网端口10的工作速率仅为100Mbit/s，使用以下哪条命令
A. speed 10
B. speed 100
C. speed auto
D. speed full
Answer: B

6. GARP本身仅仅是一个协议规范，不作为一个实体在交换机中存在。遵循GARP协议的应用实体称为GARP应用（ ）
T. True
F. False
Answer: T

7. IEEE802.1Q协议中规定的VLAN报文比普通的以太网报文增加了以下哪几部分（ ）
A. TPID （Tag Protocol Indentifier）
B. Priority
C. Canonical Format Indicator( CFI )
D. VLAN Identifier( VLAN ID )
Answer: ABCD

8. 以下说法错误的是（ ）
A. 三层交换机使用最长地址掩码匹配方法实现快速查找
B. 三层交换机使用精确地址匹配的方法实现快速查找
C. 在VLAN指定路由接口的操作实际上就是为VLAN指定一个IP地址、子网掩码和MAC地址，只有在给一个VLAN指定了IP地址、子网掩码和Mac地址后（Mac地址不需要手工配置），该VLAN虚接口才成为一个路由接口
D. 路由器的路由接口与端口是一对一的关系，而三层交换机的路由接口与端口是一 远嗟墓叵礧
Answer: A

9. 相对于路由器，三层交换机的优点有（ ）
A. 经济
B. 安全
C. 技术简单
D. 高效
Answer: ACD

10. 如下图所示配置，
Port 1至Port 4 端口对应的链路为允许所有VLAN通过的干道链路，且都启动了GVRP协议。其中，交换机1的Port 1端口GVRP注册类型配置为Fixed，其它交换机的端口GVRP注册类型配置为Normal。在交换机1上配置有VLAN 5、VLAN 6，在交换机3上配置有VLAN 6 、VLAN 7。下列是关于各交换机端口除缺省VLAN外的VLAN配置情况的描述，其中正确的选项为（ ）
A. Port 1 配置有VLAN 5至VLAN 7
B. Port 2 配置有VLAN 5至VLAN 6
C. Port 3 配置有VLAN 6和VLAN 7
D. Port 4 配置有VLAN 5至VLAN 7
Answer: C

11. 下面四种端口状态中，那种状态不是快速生成树协议所维护的端口状态（ ）
A. Blocki ng状态（ 即Discarding状态）
B. Listening状态
C. Learning 状态
D. Forwarding状态
Answer: B

12. 生成树的优先级矢量（B，0 ，B ，PortID）中的第四项是指（ ）
A. 发送端口ID
B. 接收端口ID
C. 根端口ID
D. 没有任何实际意义
Answer: A

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Exam : Huawei GB0-280
Title : Huawei(r) Constructing Enterprise-level Routing Networks

1. Bi-directional Import refers to that routes are imported mutually between routing protocols. To prevent route loop, you can ( )
A.prohibit route redistributing from 2 different routing processes which runs over the same router into each other.
B.Use filter-policy import
C.Use filter-policy export
D.Use fire-wall
Answer: ABC

2. which of the following are the right description to the backbone area? ( )
A.The backbone area ID is 0.0.0.0.
B.All other areas must connect to the backbone area.
C.Between the backbone areas it can be disconnected.
D.Each ABR (Area Border Router) should be connected to at least one backbone area.
Answer: ABD

3. Which of the following are the right description to the adjacency between routers in the OSPF protocol? ( )
A.Two routers, if they are in bidirectional adjacency, that is, they receive the Hello message from each other, they automatically become adjacent.
B.If two routers are adjacent, the underlying network between them is probably Point-to-Point.
C.If two routers are adjacent, the underlying network between them is probably Point-to-MultiPoint.
D.If two routers are adjacent, the underlying network between them is probably Broadcast. One of them must be a DR or BDR.
E.Only when the two routers are adjacent will they exchange the LSA message.
Answer: BCDE

4. Which of the following is the way to avoid loop in the BGP protocol? ( )
A.Record the source of the route in the attribute: origin
B.Record the AS route in the attribute: AS-Path
C.Record the next hop in the Next-Hop attribute
D.Affect the choice of egress for another AS in the MED attribute
Answer: B

5. The route will be matched with each if-match clause under the node of the route-policy in order. Passing one if-match clause means passing the whole route-policy. ( )
T.True
F.False
Answer: F

6. To view the information of the DR and BDR in the OSPF area, you can use ( )
A.Display ospf
B.Display ospf error
C.Display ospf interface
D.Display ospf peer
Answer: A

7. How many attributes can every RADIUS packet carry? ( )
A.1
B.2
C.3
D.Multiple
Answer: D

8. BGP community is a group of destinations with public attributes. For a network or an AS there can be only one community. ( )
T.True
F.False
Answer: F

9. RTA notifies RTB about a learned route 1.1.1.0/24 from the EBGP peer. RTA and RTB are in the same AS. The attributes of the route are listed as the following:
local preference:100
MED: 100
AS_PATH: 200
Origine: EGP
Next_hop: 88.8.8.1/16
The attributes of the received route by RTB will be ( )
A.Local preference: null, MED: 100,
　　AS_PATH: 200 100 ,Origine :EGP, next_hop: 10.110.20.1/16
B.Local preference:100, MED: 100,
　　AS_PATH: 200 ,Origine: EGP, next_hop: 88.8.8.1/16
C.Local preference:100, MED: null,
　　AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16
D.Local preference: null, MED: 0,
　　AS_PATH: 100 200, Origine: EGP, next_hop: 88.8.8.1/16
Answer: B

10. Which is wrong about the BGP protocol? ( )
A.BGP is a robust routing protocol.
B.BGP is to check the route loop.
C.BGP can not summary routes of the same type.
D.BGP inherits from EGP
Answer: C

11. In the BGP protocol, the function of the community attribute NO-EXPORT is to ( )
A.Indicate that the route with this attribute should not be notified to any peer out of the alliance
B.Indicate that the route with this attribute, once received, should not be notified to any BGP peer.
C.Indicate that the route with this attribute, once received, should not be notified to any EBGP peer.
D.None of the above
Answer: A

12. Two routers running the OSPF protocol are synchronizing the Link State Database. When you check the peer state machine on one of them, it indicates it has reached the FULL state. Therefore, such a conclusion can be drawn that if you check the peer state machine from the other router, it should also indicate that it has reached the FULL state. ( )
T.True
F.False
Answer: F

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Exam : Huawei GB0-180
Title : Huawei(r) Certified Network Engineer (HCNE)

1. Which of the following is the function of the session layer( )
A.To provide encryption/decryption
B.To provide data conversion and format
C.To set up connections between different hosts
D.To set up session between two applications
Answer: D

2. RouterA and RouterB are connected by serial interface.The configuration of router A is as below:
[Quidway1]display current-configurtion
Now create configuration…
Current configuration
!
version 1.74
local-user huawei service-type ppp password simple quidway
firewall enABle
sysname Quidway1
!
interface Aux0
async mode flow
phy-mru 0
link-protocol ppp
!
interface Ethernet0
ip ADdress 1.1.1.1 255.0.0.0
!
interface Serial0
clock DTECLK1
link-protocol ppp
ppp authentication-mode chap
ppp chap user hw
ip ADdress 2.1.1.1 255.0.0.0
!
interface Serial1
link-protocol ppp
!
quit
ip route-static 0.0.0.0 0.0.0.0 2.1.1.2 preference 60
!
return
The configuration of router B is as below:
[Quidway2]display current-configurtion
Now create configuration…
Current configuration
!
version 1.74
local-user hw service-type ppp password simple quidway
firewall enABle
sysname Quidway2
encrypt-card fast-switch
!
interface Aux0
async mode flow
phy-mru 0
link-protocol ppp
!
interface Ethernet0
ip ADdress 3.1.1.1 255.0.0.0
!
interface Serial0
link-protocol ppp
ppp chap user huawei
ppp chap password simple quidway
ip ADdress 2.1.1.2 255.0.0.0
!
interface Serial1
link-protocol ppp
!
quit
ip route-static 0.0.0.0 0.0.0.0 2.1.1.1 preference 60
!
return
WAN stands for serial link between RouterA serial interface and RouterB serial interface. LAN stands for the link between RouterA Ethernet interface and RouterB Ethernet interface. Which of the following statements is true( )
A.Both WAN and LAN can be connected
B.Neither WAN, nor LAN can be connected
C.The WAN on two ends can be connected, while LAN can not
D.The WAN on two ends can not be connected, while LAN can be connected
Answer: C

3. Logically, all the switches are mADe up of two parts( )and( )
A.Data forwarding logic
B.Switching module
C.MAC ADdress tABle
D.Input/output interface
Answer: AD

4. The principle used to evaluate the routing algorithm does NOT include( )
A.Fast convergence
B.Flexibility
C.ADvancement in topology structure
D.If the path selected is the best
Answer: C

5. Frame-relay is a ( ) protocol
A.connection-oriented
B.network
C.connectionless
D.reliABle
Answer: A

6. Input display interface on Huawei Quidway router, and which of the following information you will see?
A.The descriptions ABout the interface
B.The route information concerning the said interface
C.Error statistics
D.Interface status
Answer: ACD

7. The basic functions of transport layer are:
A.Segment upper-layer data
B.Create end-to-end connection
C.Transmit data from the host at one end to the host at the other end
D.Ensure the stABility of data transmission
Answer: ABCD

8. Which of the following command is usually used for remote loggin( )
A.PING
B.TRACERT
C.TELNET
D.IPCONFIG
Answer: C

9. ( ) is a kind of broADcast, through which the host can dynamically discover the MAC ADdress corresponding to one IP ADdress
A.ARP
B.DNS
C.ICMP
D.RARP
Answer: A

10. Which of the following authentication algorithms are used for ppp authentication?
A.MD5
B.PAP
C.CHAP
D.IPsec
Answer: BC

11. In the router, which of the following command can be used to view the routing tABle of a router( )
A.ARP -A
B.TRACERT
C.ROUTE PRINT
D.DISPLAY IP ROUTING-TABLE
Answer: D

12. IEEE802.3 Ethernet ADopts ( ) to support bus topology ,it is ABbreviated from ( ).
A.STP Spanning Tree Protocol
B.STP Shortest Tree Protocol
C.CSMA/CD Carrier Sense Multicast Access/Collision Detection
D.CSMA/CD Carrier Sent Multicast Access/CRC Detection
E.CSMA/CD Carrier Service Multiple Access/Collision Detection
F.CSMA/CD Carrier Sense Multiple Access/Collision Detection
Answer: F

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Exam : Huawei GB0-320
Title : Huawei(r) Constructing Enterprise-level Switching Networks

1. The Ethernet link layer is divided into two sub-layers by IEEE803. The two sub-layers are: ( )
A.Physical sub-layer
B.MAC sub-layer
C.LLC sub-layer
D.IP sub-layer
Answer: bc

2. If setting the working rate of Quidway S3526 Ethernet port 10 only to be 100Mbit/s, which of the following commands should be used?
A.speed 10
B.speed 100
C.speed auto
D.speed full
Answer: b

3. As shown in the following figure, the corresponding links of Port 1 ~ Port 4 are the trunk links allowing all the VLANs to pass and the GVRP protocol is activated. The GVRP registration mode of Port 4-switch 3 is set to be Forbidden and the GVRP registration modes of the ports on other switches are set to be Normal. VLAN5 and VLAN6 are configured on the switch 1 and VLAN 6 and VLAN 7 are configured on the switch 3. The following are the VLAN configuration situations of the ports of the switch except the default VLAN. Which of the items are true? ( )
A.VLAN 5 and VLAN 6 are configured over port 1.
B.VLAN 5~VLAN 6 are configured over port 2.
C.VLAN 6 and VLAN 7 are configured over port 3.
D.VLAN 6 and VLAN 7 are configured over port 4.
Answer: ab

4. Which of the following descriptions of port aggregation technology are true?
A.This technology is applied in the connection between switch and switch
B.This technology is applied in the connection between switch and router
C.The technology is not applied in the connection between the high-speed server
D.This technology is not applied in the connection between the switch and the high-speed server
Answer: ab

5. Which of the following descriptions of the transparent bridge is false?( )
A.The transparent bridge can learn the MAC address by itself.
B.The transparent bridge can expand LAN.
C.The transparent bridge needs to modify the IP packet first, and then forward it.
D.The transparent bridge is the equipment working on the layer 2.
Answer: c

6. The layer 2 switch supporting VLAN has solved the following problem: ( )
A.Security
B.High efficiency
C.Flexible management
D.All the above items are false.
Answer: abc

7. Compared with the common Ethernet packet, which of the following items are newly added in VLAN packet ruled in IEEE802.1Q protocol? ( )
A.TPID (Tag Protocol Identifier)
B.Priority
C.Canonical Format Indicator (CFI)
D.VLAN Identifier (VLAN ID)
Answer: abcd

8. Multiple layer switching is realized according to the following information. ( )
A.Source MAC address and destination MAC address
B.Source IP address and destination IP address
C.source port number and destination port number
D.IP packet protocol numbe
Answer: abcd

9. Through which of the following packets is the BPDU packet transmitted?
A.IP packet
B.TCP packet
C.Ethernet frame
D.UDP frame
Answer: c

10. Which of the following Ethernet standards support speed rate auto-negotiation? ( )
A.10BASE-T
B.100BASE-TX
C.1000BASE-LX
D.1000BASE-SX
Answer: ab

11. The GARP itself is only a protocol specification but not an entity existing in the switch. The application entity that observes the GARP protocol is called the GARP application. ( )
T.True
F.False
Answer: t

12. Which of the following descriptions of the Blocking status (Discarding status) of the spanning tree is false? ( )
A.In Blocking status, BPDU packet can be received.
B.In Blocking status, no packet can be received.
C.In Blocking status, no MAC address can be learned.
D.In Blocking status, no data packet can be forwarded.
Answer: b