儿科护理专业实践能力
单选题Which statement is true about IP telephony calls？（）AA Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.BThe voice carrier stream uses H323 to set up， maintain， and tear down call end
题目
A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.
The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.
Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice samples.
The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.
相似问题和答案
第1题：
A. They must be fully meshed
B. They can be in a different AS
C . They do not need to be directly connected
D. They must be directly connected
第2题：
Which two statements are true about voice ports on a router？ （）
- A、 Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
- B、 Calls to the PSTN can be made via FXS or T1/E1 trunk ports.
- C、 Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
- D、 Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.
正确答案:A,D
第3题：
A. It also supports PAT.
B. It requires you to configure address entries in the junos-nat zone.
C. It requires you to configure address entries in the junos-global zone.
D. The IP addresses being translated must be in the same subnet as the incoming interface.
第4题：
Which statement about the ip classless router command is true?（）
- A、The ip classless command is enabled by default in recent versions of IOS.
- B、The ip classless command should only be enabled when static routing is being used instead of a routing protocol.
- C、The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.
- D、The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.
正确答案:A
第5题：
Which three statements are true about terms in a policy?（）
- A、The order of the terms in a policy is irrelevant.
- B、The action is specified in a then statement.
- C、Terms are optional in a policy.
- D、The match condition can be identified with a from statement.
- E、A from statement is mandatory in a term.
正确答案:B,C,D
第6题：
Which two VoIP capabilities are utilized when the CallManager and the gateway are configured for Survivable Remote Site Telephony？（）
- A、 Analog phones， connected to the PSTN， act as internal call agents if IP communication to the CallManager is lost.
- B、 An onsite gateway reroutes calls over the PSTN if IP communication to the CallManager is lost.
- C、 The IP phones can reroute calls over the PSTN if IP communication to the CallManager is lost.
- D、 Local voice gateways can assume the function of a call agent if IP communication to the CallManager is lost.
- E、 IP phones use an internal call agent if IP communication to the CallManager is lost.
正确答案:B,D
第7题：
Which statement is true about interface-based source NAT？（）
- A、PAT is a requirement.
- B、It requires you to configure address entries in the junos-nat zone.
- C、It requires you to configure address entries in the junos-global zone.
- D、The IP addresses being translated must be in the same subnet as the egress interface.
正确答案:A
第8题：
A.A
B.B
C.C
D.D
第9题：
Which statement is true about IBGP routers? （）
- A、They must be fully meshed
- B、They can be in a different AS
- C、They must be directly connected
正确答案:C
第10题：
Which mode allows you to configure the B-ACD service provided in Cisco Unified CallManager Express?（）
- A、Tcl
- B、telephony
- C、application
- D、IP-telephony
- E、telephony-service
正确答案:C