單項選擇題Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects twoor more customer devices using Ethernet bridging techniques？（）

A. DPT
B. MPLS
C. VPLS
D. CWDM
E. DWDM
F. SONET/SDH


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1.多項選擇題Which two statements are correct regarding Flex Links？ （）

A. An interface can belong to multiple Flex Links.
B. Flex Links operate only over single pairs of links.
C. Flex Link pairs must be of the same interface type
D. Flex Links automatically disable STP so no BPDUs are propagated
E. Failover from active to standby on Flex Links takes less than a second

2.多項選擇題OSPF stub areas are an important tool for the Network designer； which of the following two shouldbe considered when utilizing OSPF stub areas？ （）

A. OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs
B. OSPF not so stubby areas are particularly useful as a simpler form of summarization
C. OSPF stub areas are always insulated from external changes
D. OSPF totally stubby cannot distinguish among ABRs for the best route to destinationsoutsidethe areas
E. OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPFdomain

3.多項選擇題As a critical part of the design for the Enterprise Campus network， which of the following two aretrue concerning intrusion detection and prevention solution？ （）

A. IDS is capable of both inline and promiscuous monitoring， while IPS is only capable ofpromiscuous monitoring
B. IDS will stop malicious traffic from reaching its intended target for certain types of attacks.
C. IPS processes information on Layer 3 and 4 as well as analyzing the contents and payload ofthe packets for more sophisticated embedded attacks （Layers 3 to 7）
D. IPS inspects traffic statefully and needs to see both sides of the connection to function properly
E. IDS placement at the perimeter of Data Center outside the firewall generates many warningsthat have relatively low value because no action is likely to be taken on this information