多項選擇題Which three of these statements about PPPoE are true？（）

A.PPPoE can provide a host with access to a destination over Ethernet. You can have only one  PPPoE session per PVC
B.You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE
C.You cannot use PPPoE with Cisco Service Selection Gateway
D.PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks
E.Per-session accounting is possible， which allows the service provider to charge the subscriber based on session time for various services offered. The service provider can also require a minimum access charge


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1.單項選擇題What is the order of preference for these commands when all of them are applied to one neighbor in theBGP inbound filter direction？（）

A.prefix-list， route-map， filter-list， distribute list
B.route-map， filter-list， prefix-list， distribute-list
C.route-map， distribute-list， prefix-list， filter-list
D.filter-list， prefix list， route-map， distribute list
E.distribute list， prefix-list， route-map， fitter list

2.多項選擇題What are two uRPF working modes？（）

A.express mode
B.safe mode
C.loose mode
D.strict mode
E.tight mode

3.多項選擇題Which four statements about an IP service level agreement （SLA） are true？ （）

A.SLA responder knows type of operation， the port used， and duration.
B.SLA responder inserts in and out timestamps in the packet payload.
C.SLA sender and responder use the IP SLA Control Protocol to communicate with each other before
D.SLA sender and responder communication can be encrypted.
E.SLA sender and responder communication can be authenticated with MD5.

4.單項選擇題Which OSPF LSA is used to support MPLS traffic engineering？（）

A.opaque LSA （Type 8）
B.opaque LSA （Type 9）
C.link LSA （Type 1）
D.network LSA （Type 2）
E.opaque LSA （Type 10）

5.多項選擇題Option 10A （back-to-back VRF） is an implementation of inter-AS MPLS VPN. Which of four statementsabout option 10A are not true？（）

A.MPLS is required between the ASBRs.
B.ASBR must hold all routing information.
C.It is a scalable solution.
D.It is a simple solution.
E.MP-EBGP is used to exchange routes between ASBRs.