Which of the following tools can be used to examine the contents of network traffic? Which of the following are used for managing VoIP sessions? (Select 2) Which of the following are used to implement Voice over IP (VoIP)? (Select all that apply) Which of the following protocols would be used by a video bridge to invite a video phone to join a videoconference?Ī computer programmed to act like an IP telephone is known as a(n) _. _ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing. _ is a measure of how well a network service matches its expected performance. Session Initiation Protocol (SIP) is a part of:Ī company's use of VoIP on its WAN to avoid long distance telephone charges is known as: Assign sequence numbers to each packet in a transmission Issue timestamps for every transmissionĭ. Modify each IP datagram to assign a priority levelĬ. Report on the degree of packet loss and delay in a connectionī. On a VoIP network that uses the DiffServ QoS technique, which of the following makes certain that a router forwards packets within a given time period?Ī(n) _ is a computer that manages multiple media gateways.Ī. Using VoIP overa WAN allows an organization to avoid paying long-distance telephone charges, a benefit known as _. Marking of DNS and ENUM queries requires the creation of a Differentiated Services media policy, and the assignment of such a policy to a specific realm.Which of the following is the most popular signaling protocol used on traditional, circuit-switched PSTN connections? Class Selector PHBs - maintain compatibility with previous TOS (type of service) precedence usage - defined in RFC 2474.RFC 3260, New Terminology and Clarifications for Diffserv RFC 2597, Assured Forwarding PHB Group, and Assured Forwarding (AF) PHB - assured delivery within subscriber limits - defined in.Expedited Forwarding (EF) PHB - low-loss, low-latency - defined in RFC 3246, An Expedited Forwarding PHB.Default PHB - required best effort service - defined in RFC 2474.In practice, however, network offerings generally consist of a much smaller suite, which typically includes: In theory, DS supports 64 distinct classifications. PHBs are generally defined in terms of call admission controls, packet drop criteria, and queue admission algorithms. The DSCP maps to a per-hop-behavior (PHB) that defines an associated service class. Specific service classifications are identified by a DSCP, essentially a numeric index. IETF RFC 2475, An Architecture for Differentiated Services ( ).ĭS provides a mechanism to define and deliver multiple and unique service classifications that can be offered by a service provider. IETF RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers ( ) Release S-CX6.4.0M3 adds the capability to mark DNS and ENUM queries.įor basic information about DS, refer to:ĪCLI Configuration Guide Realm-Based Packet Marking topic in the Realms and Nested Realms chapter, which provides information on currently supported DS marking of SIP and RTP packets Previous software releases provided the capabilities to mark standard SIP and Real-Time Protocol (RTP) messages. This mandate requires that network elements function as a DS marker - that is as a device that sets the Distributed Services Codepoint (DSCP) in the Differentiated Services field of the IP header. Oracle Communications Session Border Controller can mark DNS/ENUM packets with a configurable differentiated services code point (DSCP).Ĭertain service providers mandate support for Differentiated Services (DS) on all traffic streams exiting any network element.
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