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Gateway 7001 Series User Manual

Page 197

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TCP

The Transmission Control Protocol (TCP) is built on top of Internet Protocol (

IP

). It adds

reliable communication (guarantees delivery of data), flow-control, multiplexing (more
than one simultaneous connection), and connection-oriented transmission (requires the
receiver of a packet to acknowledge receipt to the sender). It also guarantees that packets
will be delivered in the same order in which they were sent.

TCP/IP

The Internet and most local area networks are defined by a group of protocols. The most
important of these is the Transmission Control Protocol over Internet Protocol (TCP/IP), the
de facto standard protocols. TCP/IP was originally developed by Defense Advanced
Research Projects Agency (DARPA, also known as ARPA, an agency of the US Department
of Defense).

Although

TCP

and

IP

are two specific protocols, TCP/IP is often used to refer to the entire

protocol suite based on these, including ICMP, ARP,

UDP

, and others, as well as applications

that run on these protocols, such as telnet, FTP, etc.

TKIP

The Temporal Key Integrity Protocol (TKIP) provides an extended 48-bit initialization vector,
per-packet key construction and distribution, a Message Integrity Code (MIC, sometimes
called “Michael”), and a re-keying mechanism. It uses a

RC4

stream cipher to encrypt the

frame body and CRC of each

802.11

frame before transmission. It is an important

component of the

WPA

and

802.11i

security mechanisms.

ToS

TCP/IP

packet headers include a 3-to-5 bit Type of Service (ToS) box set by the application

developer that indicates the appropriate type of service for the data in the packet. The
way the bits are set determines whether the packet is queued for sending with minimum
delay, maximum throughput, low cost, or mid-way “best-effort” settings depending on the
requirements of the data. The ToS box is used by the Gateway 7001 Series self-managed
AP to provide configuration control over Quality of Service (

QoS

) queues for data transmitted

from the AP to client stations.

UDP

The User Datagram Protocol (UDP) is a transport layer protocol providing simple but
unreliable datagram services. It adds port address information and a checksum to an

IP

packet.

IP address

192.168.2.128

11000000 10101000 00000010 10000000

net mask

255.255.255.0

11111111 11111111 11111111 00000000

Resulting network address

192.168.2.0

11000000 10101000 00000010 00000000