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Cisco CCNA Commands

Cisco CCNA Commands CHAPTER 3 Configuring a Router This chapter provides information and commands concerning the following topics: • Configuring a router, specifically: — Names — Passwords — Interfaces — MOTD banners — IP host tables — Saving and erasing your configurations • show commands to verify the router configurations Router Modes: Router> User mode Router# Privileged mode Router(config)# Global configuration mode Router(config-if)# Interface mode Router(config-subif)# Subinterface mode Router(config-line)# Line mode Router(config-router)# Router configuration mode TIP: There are other modes than these. Not all commands work in all modes. Be careful. If you type in a command that you know is correct—show run, for example—and you get an error, make sure that you are in the correct mode. Router> User mode Router# Privileged mode Router(config)# Global configuration mode Router(config-if)# Interface mode Router(config-subif)# Subinterface mode Router(config-line...
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Networking Basics

 Networking Basics  Part I – Internetworking ISO’s(International Organization for Standardization) OSI (Open Systems Interconnection) Model: Layer PDUs Remarks, Examples 7 Application WWW, E-mail gateways, user interface. Also responsible for understanding the resources needed to communicate between two devices and establish their availability. SMTP, FTP. 6 Presentation Translates and converts data into a known format such as ASCII, JPEG, MIDI, MPEG, encryption, compression. The only layer that can actually change data. 5 Session Data Keeps different applications’ data separate, NFS, SQL, RPC, NetBIOS names, X Window. Offers three modes – full-duplex, half-duplex and simplex. Maintains communication channels and provides dialogue control. Managing, setting up and tearing down sessions. 4 Transport Segments Reliable or unreliable delivery, error correction before retransmit, TCP/UDP. Performs flow control, end-to-end connection. Port numbers are used at this layer. Multi...
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