CCIE系列认证单项选择题每日一练(2019.05.05)

单项选择题
Which one of these statements is true of OSPF type 5 LSAs？（）
A.They are used to summarize area routes to other areas.
B.They are used in not-so-stubby areas to propagate external routes.
C.They are used to notify areas of the ASBR.
D.They are flooded to all areas except stub areas （external route）.
单项选择题
A network is composed of several VRFs. It is required that VRF users VRF_A and VRF_B be able to route to and from VRF_C，which hosts shared services. However，traffic must not be allowed to flow between VRF_A and VRF_B. How can this be accomplished？（）
A.route redistribution
B.import and export using route descriptors
C.import and export using route targets
D.Cisco MPLS Traffic Engineering
单项选择题
In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）
A.for trail trace identification
B.as the backward defect indicator
C.to transmit information between OTU termination points
D.to extend command and management functions over several frames
E.General communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH
单项选择题
There are two cabling schemes to choose from when implementing a Cisco CRS-1 multishelf system：single-module cabling and multimodule cabling. What is the maximum capacity of the LCCs that aresupported in multimodule cabling？（）
A.9 LCCs
B.7 LCCs
C.10 LCCs
D.6 LCCs
E.8 LCCs
单项选择题
Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）
A.BGP peers must be Layer 2-adjacent.
B.EBGP multihop is not configured.
C.The firewall is not configured to allow IP protocol 89.
D.The firewall is not configured to allow UDP 179.