多项选择题

WhataretheDSL-specificfactorsthatrequireadditionalbandw……

What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）

A.A voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth.
B.ADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet.
C.A voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead.
D.IPSec requires additional overhead for the header and hash.
E.ADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.

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热门试题

单项选择题Refer to the exhibit. With an IPSec tunnel established between remote Router A and head-end router B, how can the Service Provider Edge Router identify Voice over IP packets flowing through the IPSec tunnel from a Cisco 7960 IP phone?（）

A.UDP ports 16384 through 32727
B.ESP packets less than 113 byes
C.DiffServ codepoint EF Expedited Forwarding
D.RTP ports 6970 through 6999

单项选择题Refer to the exhibit. An enterprises security policy disallows the use of wireless on a Teleworker PC. Choose the most appropriate 830 security feature to use to enforce the security policy.（）

A.802.1X authentication
B.authentication proxy
C.Context Based Access Control
D.Lock and Key authentication

单项选择题Refer to the exhibit. Available public Internet sites are sometimes used for estimating performance. Which statement regarding their use for estimating VPN performance is correct?（）

A.Throughput results are valid as a value from the Teleworker's home to the corporate site, regardless of the location of the public test server.
B.Throughput results may not be valid due to the public server's location on the Internet and fluctuations based on the use of the public server.
C.Throughput values are not affected by the choice of split tunneling or Internet access through the VPN.
D.Throughput results are unrelated to the Teleworker PC configuration or current PC use.

单项选择题Whatistheminimumrecommendeduplink downlinkspeedtosupportasingleencryptedIPvoiceTeleworkercall?（）

A.256kbps / 1024kbps
B.256kbps / 1544kbps
C.160kbps / 768kbps
D.384kbps / 384kbps
E.128kbps / 512kbps

单项选择题Forbestpacketswitchingperformancewithcrypto,whatistherecommendpacketswitchingpathinaCiscoTeleworkerRouter?（）

A.Process Switching
B.Silicon Switching
C.Cisco Express Forwarding (CEF) Switching
D.Autonomous Switching