MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2b. Delay - the time interval between transmitting and receiving packets (i.e.latency);c. Delay variation – the variation in duration between all packets in a stream takingthe same route (i.e. jitter); andd. Packet loss rate – the maximum rate at which can be discarded during transferthrough a network. This actually results from congestion.TRAFFIC CLASSIFICATION225. To provide preferential service to a type of traffic, it must first be identified and thenthe packet may or may not be marked. These two tasks make up classification:a. When the packet is identified but not marked, classification is said to be on aper-hop basis. With this per-hop basis, the classification pertains only to thedevice that it is on, and is not passed to the next router. This happens withPriority Queuing (PQ) and Custom Queuing (CQ); andb. When packets are marked for network-wide use, IP precedence bits can be set.226. Common methods of identifying flows include Access Control Lists (ACLs), policybasedrouting, Committed Access Rate (CAR), and Network-Based Application Recognition(NBAR).CONTROL227. Flexible policies are required to protect critical applications, to regulation ―greedy‖traffic, to limit recreational usage, and block malicious traffic. These policies should be ableto:a. Protect the performance of important applications;b. Contain unsanctioned and recreational traffic;c. Provision steady streams for inelastic applications such as voice and VTC;d. Stop applications or users from monopolizing the link;e. Reserve or cap bandwidth; andf. Provision bandwidth between multiple locations, groups or users.SERVICE LEVELS228. Service levels refer to the actual end-to-end QoS capabilities, meaning the capabilityof a network to deliver service needed by specific network traffic from end to end or edge to2-5 OriginalUNCLASSIFIED