Its main purpose how to secure the network.

2. Contents
• Components of Network Security
• Switching
• STP
• Port-security Feature
• VLAN
• NAT
• ACL
• WAN Connection

3. NETWORK SECURITY

4. Components of network security
• Integerity
• Confidentiality
• Non-Repudation
• Authorization
• Authentication

5. Switching
Functions of switch
 Address Learning
 Forwarding filtering decision
 Loop Avoidance
Modes of switch
 Store and forwarding
 Fragment Free
 Cut throw transmission

6. Spanning Tree Protocol
Rebundancy Give loops
 Switching loops give problems
if all the links are active
 Broadcast Storm
 Multiple frame transmission
 Inconsistent switch tables
Spanning –Tree port states

7. Port Security
Access layer switches supports feature port security,vlan etc
To configure enable port security
 Define an Interface
 Enable port-security Feature
 Defining which mac-address are
allowed to send frames
Two steps are optional
 Defining the maxi.no.of mac-address
 Defining the action that switch will take

8. VLAN
• What is VLAN ?
• Need of VLAN?
• What is Access and Trunk Port
• What is Frame Tagging?
 ISL
 IEEE 802.1q

9. Inter-vlan Communication
Two methods are available for communication between vlan’s –
 Router on a sticky(with trunking enabled)
 Using a router (without trunking)

10. Virtual trunking protocol
VTP Modes
Example

11. Network Address Translation(NAT)
There are three methods of Nating-
1. Static
2. Dynamic
3. PAT

12. Access Control List
Standard
Extended
Name-based

13. WAN Connection Types

14. Point-to-Point Protocol(PPP)
LCP Configurations
 Authentication
 Compression
 Error Detection
 PPP CallBack
PPP Authentication Methods
 PAP
CHAP
hostname r1 hostname r2
username r2 password cisco username r1 password cisco
int s0/0 int s0/0
ip add 10.0.1.1 255.255.255.0 ip add 10.0.1.2 255.255.255.0
Encapsulation ppp Encapsulation ppp
ppp authentication pap ppp authentication ppp

15. Frame-Relay
• Connection before and after frame relay
• The process of Forwarding a Packet-