U

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UDP ( User Datagram Protocol)
        applications
        for mobility
        segments
UDP checksum field
UDP length field
UID (user information database)
Ultrapure fused silica
Unbuffered switching networks
Uncontrolled GFC
Unguided transmission links
UNI (user-network interface) 2nd
Unicast addresses
Unidirectional congestion control
Uniform random variables
Uniform resource locators (URLs)
Uniform switching networks
Union of events
Update packets
        BGP
        TORA
Updates
        automatic
        in ad-hoc networks
        RIP routing tables
Upstream bandwidth, ADSL
Upstream grant processors
Urgent (URG) field
Urgent pointer field
URLs (uniform resource locators)
Usage parameter control
User agents
        H.323
        SIP
User authentication
User Datagram Protocol (UDP)
        applications
        for mobility
        segments
User information database (UID)
User mailboxes
User plane
User tracking in cellular networks
User-network interface (UNI) 2nd
Utilization
        in CSMA
        in feedback models
        in M/M/1 queueing systems
        link