单选题 TFTP服务器使用何种传输层协议,端口号是()What Transprt Layer Prtcl des TFTP server applies and what is the prt number?()
A、UDP 69
B、UDP 53
C、TCP 67
D、TCP 23
单选题 vlan ID在以太网帧中占()位bit.vlan ID is f _bits in Ethernet frame.
单选题 二层交换机单播转发表应包含的表项是()Unicast frwarding table f L2 switch cntains the fllwing_()
A、Mac,VlanID
B、IP,VlanID
C、Mac,Prt,VLAN
D、IP,Prt
单选题 下列关于以太网的说法哪个是不正确的()Which f the fllwing statements regarding Ethernet are nt crrect?()
A、千兆以太网只能提供全双工通信Gigabit Ethernet is nly able t prvide full duplex cmmunicatin
B、千兆以太网具有自动协商功能,可以和百兆以太网自动适配速率Gigabit Ethernet is prvided with aut negtiatin functinsand able t adapt rate with megabit Ethernet
C、千兆以太网采用5类双绞线,互连长度不能超过100米Gigabit Ethernet adpts Type5 TP and the1 ength fr cnnectin canntbe mre than 100M
D、快速以太网可以提供全双工通信,总带宽达到200兆Fast Ethernet is able t prvide ful1 duplex cmmunicatin,with ttal bandwidth is able t reach 200M
单选题 Radius服务器在实际组网中位置为The lcatin f Radius server in the actual netwrking is().
A、只能挂在bras下:It can nly be placed under BRAS.
B、只能挂在bras或其上端的路由器设备上:It can nly be placed n BRAS r the ruter device n it.
C、可以挂在任意从bras上可以ping通的地方:It can be installed at any place which can be pinged frm BRAS.
D、以上都不对:Nne f the abve is crrect.
单选题 "当路由器某端口接收的IP报文的MTU大于该路由器该端口的最大MTU(MRU)时,采取的策略是()"If MTU of an IP packet received at one router interface exceeds the maximum MTU (MRU)set for the interface,the router will()
A、直接转发该分组Directly forward the packet
B、将该分组分片Fragment the packet
C、向源路由器发出请求,减小其分组大小Send a request to the source router for packet size reduction.
D、丢掉该分组Drop the packet
单选题 __是一个网络层的协议,它提供了错误报告和其它回送给源点的关于P数据包处理情况的消息()__is a netwrk layer prtcl.It prvides errr reprt and IP packet prcessing messages that are sent back t a surce prt.()
A、ICMP
B、UDP
C、TCP
D、IGMP
单选题 在以太网的帧结构中,帧首定界符的长度为一个字节,其值为()In Ethernet frame structure,StartFrameDelimiter(SFD)is nebyte,the value is _
A、10000010
B、101011
C、10000001
D、10101011