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Cisco™ CCNA : OSI and TCP/IP

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Application : Responsible for identifying and establishing the availability of desired

comm partner and verifying sufficient resources exist for comm. Ex: FTP, SMTP

Presentation : Responsible for presenting the data in standard formats. Some

Presentation layer standards are JPEG, MPEG, MIDI, PICT, Quick Time, TIFF.

Session : Responsible for co-ordinating communication between systems/nodes.

Some of the session layer protocols and interfaces: NFS, RPC, SQL, ASP, DNA SCP

OSI MODEL

Transport : Responsible for multiplexing upper-layer applications, session mgmt

tearing down of virtual circuits, flow control and to maintain data integrity.

TCP/IP MODEL

Application : Defines TCP/IP application protocols and how

host programs interface with transport layer services to use

the network. Ex: FTP, SMTP, Telnet

Transport : Provides communication session management between

host computers. Ex: TCP, UDP

Internet : Performs routing of IP datagrams.

Ex: IP, ARP, ICMP

Some important port numbers

FTP : Port 20-21 Telnet : Port 23 DHCP : Ports 67 and 68 POP3 : Port 110

TFTP : Port 69 SMTP : Port 25 DNS : Port 53 HTTP : Port 80

Network : Responsible for sending packets from the source network to the destination

network using routing methods. Routers work at network layer.

Datalink : Consists of LLC sublayer and MAC sublayer. LLC handles error control, flow

flow control, framing etc. MAC handles access to shared media such as ethernet.

Physical : Responsible for ultimate transmission of data over network communications

media. Some of the standard interfaces at physical layer are EIA/TIA-232, V.24,V.35, HSSI

Physical : Controls the hardware devices and media that make

up the network.

Port numbers used by TCP/UDP

0-255 : Used for public applications

255-1023 : Assigned to companies

Above 1023 : Used by upper layers to set up sessions with other hosts and by

TCP to use as source and destination addresses.

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Inhaltsverzeichnis

Seite 1 - Cisco™ CCNA : OSI and TCP/IP

Seite 2 - Cisco™ CCNA : IOS

Seite 3

Seite 4 - Cisco™ CCNA : IPv4 Addressing

Seite 5

Seite 6 - Cisco™ CCNA : Subnetting

IPv6 : Points to Remember 1. IPv6 address is 128 bits in length represented in hexadecimal 2. IPv6 Loopback address is 0:0:0:0:0:0:0:

Seite 7

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Seite 8

Seite 9

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Seite 10 - Cisco™ CCNA : EIGRP and OSPF

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Seite 11 - Cisco™ CCNA : Frame Relay

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Seite 12 - Cisco™ CCNA : Access-Lists

Seite 13 - Cisco™ CCNA : NAT

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Seite 14 - Cisco™ CCNA : IPv6 Addressing

Seite 15

Seite 16 - Cisco™ CCNA : VLANs and VTP

Seite 17 - Selection Criteria

Seite 18 - Cisco™ CCNA : Show Commands

Seite 19

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Cisco CCNA NETWORK SIMULATOR Handbuch

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