思科认证考试
Under which two circumstances would an RSTP bridge flush its CAM table？（）A、upon a port state changeB、upon receiving a topology change notificationC、when transitioning from discarding to forwardingD、when transitioning from forwarding to discardingE、only wh
题目
Under which two circumstances would an RSTP bridge flush its CAM table？（）
- A、upon a port state change
- B、upon receiving a topology change notification
- C、when transitioning from discarding to forwarding
- D、when transitioning from forwarding to discarding
- E、only when changing from listening to discarding
- F、when CAM resources have been completely used up
参考答案和解析
相似问题和答案
第1题：
A. local
B. OSPF
C. direct
D. BGP
第2题：
A.local
B.OSPF
C.direct
D.BGP
第3题：
Risk can be divided into two basic types; business risk and pure (or insurable risk). Of the following, which one(s) fall(s) under business risk?
A liability loss
B direct property loss
C profit loss
D personnel-related loss
E B and C
第4题：
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（请作答此空）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.
B.ANSI
C.CCITT
D.IEEE
IEEE是由多个研究底层协议的机构组成的权威组织。
以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
具有较大的带宽，FDDI的设计带宽为100Mbit/s。
具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。
第5题：
On which vessels are the officers and deck crew allowed to operate under a two-watch system on voyages of less than 600 miles?
A.Towing vessels
B.Offshore supply vessels
C.Barges，when manned
D.All of the above
第6题：
A. by assigning the RD under the routing-instances
B. by assigning the RD under protocols bgp
C. by assigning the RD under routing-options
D. by assing the RD under policy-options
第7题：
A.MTU and speed must be configured under each unit.
B.Physical parameters such as MTU, duplex mode, and speed are configured under the interface name.
C.IP and IPv6 addresses are configured under a unit-number.
D.DLCI numbers, VPI/VCI values, and VLAN tags are physical parameters.
第8题：
84 Risk can be divided into two basic types; business risk and pure (or insurable risk). Of the following, which one(s) fall(s) under business risk?
A. liability loss
B. direct property loss
C. profit loss
D. personnel-related loss
E. B and C
第9题：
A vessel on the high seas that is not under command shall display which of the following day signals? ______
A.Two black balls
B.Three black balls
C.Two red balls
D.Three red balls
一船在公海上失控应显示以下哪个日间信号？两个黑球
第10题：
Paint is stowed in the paint locker, which is usually situated （）.
- A、under the bridge
- B、at the bow
- C、under the forecastle
- D、at the stern
正确答案:C