All secure domain routers （SDRs） have shared attributes and resources. Which three resources areshared among all SDRs？ （）

单项选择题Inopticalchanneltransportunitoverhead（OTUOH），whataregeneralcommunicationchannels1and2（GCC1 GCC2）usedfor？（）

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

多项选择题WhichthreeofthesestatementsaboutPPPoEaretrue？（）

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

单项选择题WhatistheorderofpreferenceforthesecommandswhenallofthemareappliedtooneneighborintheBGPinboundfilterdirection？（）

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

多项选择题WhataretwouRPFworkingmodes？（）

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

多项选择题WhichfourstatementsaboutanIPservicelevelagreement（SLA）aretrue？（）

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.