Lecture CCNA Exploration 4.0 (Kỳ 1) - Chapter 11: Configuring and testing your Network

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This chapter define the role of the Internetwork Operating System, use Cisco CLI commands to perform basic router and switch configuration and verification, given a network addressing scheme, select, apply, and verify appropriate addressing parameters to a host,... inviting you refer.

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Nội dung Text: Lecture CCNA Exploration 4.0 (Kỳ 1) - Chapter 11: Configuring and testing your Network

Configuring and Testing Your Network Network Fundamentals – Chapter 11 1
Học viện mạng Bách Khoa - Website: www.bkacad.com 2
Objectives • Define the role of the Internetwork Operating System (IOS) • Use Cisco CLI commands to perform basic router and switch configuration and verification • Given a network addressing scheme, select, apply, and verify appropriate addressing parameters to a host • Use common utilities to verify network connectivity between hosts • Use common utilities to establish a relative performance baseline for the network Học viện mạng Bách Khoa - Website: www.bkacad.com 3
Configuring Cisco Devices – IOS Basic Học viện mạng Bách Khoa - Website: www.bkacad.com 4
Cisco IOS 10.1.1 • Similar to a PC, a router or switch cannot function without an operating system. • The Cisco Internetwork Operating System (IOS) is the system software in Cisco devices. It is the core technology that extends across most of the Cisco product line. Học viện mạng Bách Khoa - Website: www.bkacad.com 5
Cisco IOS • The Cisco IOS provides devices with the following network services: – Basic routing and switching functions – Reliable and secure access to networked resources – Network scalability • The IOS operational details vary on different internetworking devices, depending on the device's purpose and feature set. • The services provided by the Cisco IOS are generally accessed using a command line interface (CLI). Học viện mạng Bách Khoa - Website: www.bkacad.com 6
Cisco IOS • The IOS file: – several megabytes, is stored in a semi- permanent memory area called flash. – Flash memory provides non-volatile storage. • Using flash memory allows the IOS to be upgraded to newer versions or to have new features added. • The IOS may be copied into RAM when the device is powered on and the IOS runs from RAM when the device is operating. This function increases the performance of the device. Học viện mạng Bách Khoa - Website: www.bkacad.com 7
Cisco IOS Học viện mạng Bách Khoa - Website: www.bkacad.com 8
Access Methods 1.Console 2.Telnet or SSH or HTTP , HTTPS 3.AUX port Học viện mạng Bách Khoa - Website: www.bkacad.com 9
Access Methods • Use the CLI to access various IOS configuration modes on a device Học viện mạng Bách Khoa - Website: www.bkacad.com 10
Console • Low speed serial connection to directly connect a computer or terminal to the console port on the router or switch. • Provides out-of-band access to a router • Often used to access a device when the networking services have not been started or have failed. Học viện mạng Bách Khoa - Website: www.bkacad.com 11
Console • Examples of console use are: – The initial configuration of the network device – Disaster recovery procedures and troubleshooting where remote access is not possible – Password recovery procedures • By default: console access does not require any form of securit. However, the console should be configured with passwords to prevent unauthorized device access. • The device should be located in a locked room or equipment rack to prevent physical access. Học viện mạng Bách Khoa - Website: www.bkacad.com 12
Telnet and SSH • Telnet – Require active networking services on the device. – Run on layer 7 in OSI model • Secure Shell (SSH) protocol – Like telnet but more secure access – Stronger password – Uses encryption when transporting session data • As a best practice, always use SSH in place of Telnet whenever possible. Học viện mạng Bách Khoa - Website: www.bkacad.com 13
Telnet and SSH Học viện mạng Bách Khoa - Website: www.bkacad.com 14
AUX • Can used locally, like console port • Console port is also preferred over the auxiliary port for troubleshooting because it displays router startup, debugging, and error messages by default. Học viện mạng Bách Khoa - Website: www.bkacad.com 15
Configuration file 11.1.2 startup-config running-config Học viện mạng Bách Khoa - Website: www.bkacad.com 16
Configuration files • A Cisco network device contains 2 configuration files: –The running configuration file - used during the current operation of the device –The startup configuration file - used as the backup configuration and is loaded when the device is started Học viện mạng Bách Khoa - Website: www.bkacad.com 17
Types of Configuration Files • The running configuration file – Changes to the running configuration will immediately affect the operation of the Cisco device • The startup configuration file – The startup configuration file or startup-config file is stored in non- volatile RAM (NVRAM) Học viện mạng Bách Khoa - Website: www.bkacad.com 18
Cisco IOS Modes 11.1.3 Học viện mạng Bách Khoa - Website: www.bkacad.com 19
Cisco IOS Modes Học viện mạng Bách Khoa - Website: www.bkacad.com 20