Cisco^® CCENT Exam Cram Notes : Cisco Router (25xx Series) And Its Interfaces

2. Cisco IOS

2. Cisco Router (25xx series) and its interfaces

A 2501 Cisco router is considered for the purpose of understanding typical Cisco router interfaces. Please note that this is an entry level router, and the interfaces may be quite complex for high end routers.

2.1 Interfaces Explained

Console port: This is used for connecting a console to the router. The console terminal will have direct connection to the router, and you will be able to access all router interfaces and configure the same. When you receive a new router, you need to use the console port to configure it.

Auxiliary port: Auxiliary port is used to access the router remotely using a modem. For this purpose, you need to have the auxiliary port configured before hand.

Synchronous ports: 2501 has two synchronous ports as shown in the figure. These ports can be used to connect to any serial line.

Ethernet AUI port: This port is used for connecting to the LAN.

2.2 Console port configuration

The console and auxiliary ports on Cisco IOS^® routers are asynchronous serial ports. The console port and the auxiliary port are configured as data terminal equipment (DTE). 2500, 2600, and 3600 Series Routers use RJ-45 connectors on both console and auxiliary ports. You need to use appropriate adapter to connect to the external console or modem as required.

This table shows the console port configuration for the RJ-45 connector:

CCENT Cram Notes Contents

• 1. OSI and DoD Models
  • 1.1. OSI Models and its function
  • 1.2. DOD Models and its function
  • 1.3. TCP and UDP
  • 1.4. TCP and UDP Frames
• 2. Network topologies and Flow control
  • 2.1 Different Types of N/w Topologies
  • 2.2 CSMA/CD
• 3. Wireless LANs (SSIDs, WLC, etc.)
• 4. IPv4 Addressing
  • 4.1. Subnetting (IP4)
  • 4.2 VLSM
  • 4.3 Examples on subnetting
• 5. IPv6 addressing
• 6. Wide Area Networks (WANs)
  • 6.1. DTE and DCE
  • 6.2 Different cable types
  • 6.3 Interface specifications
• II. Cisco IOS
  • 1. Cisco Router Architecture
    • 1.1 Block Diagram
    • 1.2 Architectural Components of a Router
    • 1.3 Memory Details of a Typical Cisco Router
  • 2. Cisco Router (25xx series) and its interfaces
    • 2.1 Interfaces Explained
    • 2.2 Console Port Configuration
  • 3. Router modes of operation
  • 4. Frequently used copy commands
  • 5. Different types of router passwords
• III. Routing Fundamentals
  • 1. Routed and Routing Protocol
  • 2. Routing protocol types
  • 3. CDP and LLDP
  • 4. Static and Default route
  • 5. Floating static route
  • 6. IP routing and PPP
  • 7. RIP and RIPv2
• IV. Switching Fundamentals
  • 1. Introduction to Cisco Switches
  • 2. VLANs and VTP
  • 3. VLAN Frame tagging
  • 4. Switching methods
  • 5. Switch configuration commands
  • 6. File systems available in Catalyst switches and their usage
  • 7. Switch ports and port security
• V. Infrastructure Services & Maintenance
  • 1. DNS
  • 2. DHCP
  • 3. NAT
  • 4. Access-lists
  • 5. Diagnostic commands
  • 6. Show commands and other related commands
• VI. Appendix
  • 1. IEEE standards