Komp_tehnologii_lektsii

Packet Switching

,

, . –

.

Parity Bit

, ,

( ).

PCM (Pulse Code Modulation)

( , )

64 Kbps.

Physical Layer ( )

OSI,

. ,

.

Physical Media ( )

.

OSI (Layer 0). ( , )

, . .

OSI.

Ping: Packet internet groper.

,

(ICMP echo request – ICMP)

. : "Ping host X to see if it is up!"

Port ( )

, Internet

.. selector. , .

.

PPP: Point-to-Point Protocol.

SLIP, PPP -

, .

Presentation Layer ( )

OSI,

( )

.

Protocol ( )

,

.

Proxy

,

. Proxy- ,

, .

PSTN (Public Switched Telephone Network

)

,

, .

PVC Permanent Virtual Circuit )

.

QoS (Quality of Service)

. QoS

, .

130

RARP: Reverse Address Resolution Protocol.

Internet ,

Internet . RARP ( )

Internet. . ARP.

Repeater ( )

,

. OSI

. . bridge router.

RFC: Request For Comments.

, 1969

Internet . ( , ) RFC Internet, Internet RFC.

RFC InterNIC.

RMON

,

.

Router ( )

,

.

,

,

("routing metrics"). OSI

. . gateway, bridge repeater.

Routing

.

RPC: Remote Procedure Call.

.

.

, , RPC.

RS-232C

.

Serial Transmission

, ,

( ) .

Session Layer ( )

OSI,

.

Sharing Device

,

.

, , .

Shielding

(EMI/RFI).

SLIP: Serial Line IP.

Internet, IP

( RS-232).

SLIP PPP.

SMTP: Simple Mail Transfer Protocol.

Internet. RFC 821,

RFC 822.

131

SNMP (Simple Network Management Protocol

)

SNMP

. TCP/IP. SNMP-2

SNMP .

SONET (Synchronous Optical NETwork )

.

SONET 51.84 Mbps 2.5 Gbps.

Space

– .

.

SQL: Structured Query Language.

.

STP (Shielded Twisted Pairs )

,

.

Subnet mask ( )

. address mask.

Subnetwork ( )

OSI,

.

X.25, .

SVCSwitched virtual circuit

.

Switched 56

,

56Kbps.

Synchronous Transmission

,

, .

T1

, AT&T

DS1 1.544 Mbps. 1 24

(timeslot).

T3

.

TCP: Transmission Control Protocol.

Internet,

, , .

. . TP4.

TCP/IP (Transmission Control Protocol/Internet Protocol

Internet)

Internet (Internet Protocol Suite).

Internet

.

Telnet

Internet.

.

132

TFTP (Trivial File Transfer Protocol)

,

FTP. TFTP

. FTP

TFTP USD.

Token Ring

, IEEE 802.5.

(supervisory frame), (token),

. ,

,

.

Transceiver ( )

. ,

, Ethernet. Ethernet

, .

Transport Layer ( )

OSI,

.

UART (Universal Asynchronous Receiver Transmitter)

FIFO,

.

UDP (User Datagram Protocol)

Internet. UDP, TCP,

IP ; , TCP, UDP

.

Unbalanced Line

,

, ( ,

).

USD (User datagram Protocol)

.

UTP (Unshielded Twisted Pair )

, "

".

UUCP: UNIX to UNIX Copy Program.

, UNIX- .

WAN (Wide-Area Network )

,

.

WINS (Windows Internet Naming Service)

Internet Windows, Microsoft. WINS

IP-

TCP/IP. WINS-

DHCP.

X.25

ITU – TSS ( CCITT ),

(packet data networks – PDN).

133

1.. , , / . ,

. .- .: , 2001.- 672 .

2.. /

. . – .: , 2005.- 544 .

3./ . .- .: , 2003.- 560 .

4.Web- / . .- 2- .- .: «

», 2004.- 512 .

5.HTML XHTML. 10 , 3- ./

. .- .: « », 2003.- 224 .

6.www.citforum.ru

7.www.ixbt.com

8.www.hardnsoft.ru

9.www.compress.ru

10.www.yandex.ru

11.www.ivnet.ru

134

135

.

16.02.2006. 60×841/16. . . 7,91. .- . 8,77. 100 .

“ ”

153000, . , . . , 7

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