ROUTER Routers have the following components: CPU NVRAM RAM ROM (FLASH) IOS Cisco 2800 Series Router

ROUTER PORTS

PATH DETERMINATION

ROUTING TABLES

IP ADDRESS RANGES *127 ( ) is a Class A address reserved for loopback testing and cannot be assigned to a network.

IP – V4 ADDRESS CLASSES Class A: Class B: Class C: Class D: Multicast Class E: Research Network Host Network Host Network Host 8 Bits

PUBLIC IP ADDRESSES

PRIVATE IP ADDRESSES ClassPrivate Address Range A to B to C to

SUBNETWORKS  Smaller networks are easier to manage.  Overall traffic is reduced.  You can more easily apply network security policies.

Base Net: = /24 Subnet #0: = /27 Subnet #1: = /27 Subnet #2: = /27 Subnet #3: = /27 Subnet #4: = /27 Subnet #5: = /27 Subnet #6: = /27 Subnet #7: = /27

HOW ROUTERS USE SUBNET MASKS

Supernetting

NETWORK ADDRESS TRANSLATION (NAT)  An IP address is either local or global.  Local IP addresses are seen in the inside network.  Global IP addresses are seen in the outside network.  Assignment can be static or dynamic.

WHAT IS IPSEC? IPsec acts at the network layer, protecting and authenticating IP packets.  It is a framework of open standards that is algorithm independent.  It provides data confidentiality, data integrity, and origin authentication.

IPSEC SECURITY SERVICES  Confidentiality  Data integrity  Authentication

ENCRYPTION ALGORITHMS (CONFIDENTIALITY) Encryption algorithms:  DES  AES  3DES  RSA

DATA INTEGRITY Hashing algorithms:  HMAC-MD5  HMAC-SHA-1

IPSEC SECURITY PROTOCOLS

IP V6 INTRODUCTION Research start from 1994, Implemented Oct bit Support ( 64 Network + 64 Host ) More Levels of Addressing Hierarchy Form is X : X : X : X : X : X : X : X ( Each X Refers to 4 Digit Hex Integer (16 Bit)) Prefix-Length Mask Interface Add

FP : Format Prefix TLA : Top Level Aggregator – Assign by IANA – Local Internet Registry Res : Reserved Address for TLA or NLA NLA : Next Level Aggregator – Customer Site SLA : Site Level Aggregator – Individual Organization Interface ID

TYPE OF IP V6 ADDRESSES 1.Global Unicast Address (Public) ::/3 - used in Routable environment - Same as Public Address in IP-V4 2.Link – Local Address (Private) - FE80::/10 - Used in Local LAN – Non Routable Environment - Same as Private Address in IP - V4 Mobile IP: MAC : 0012 : 36 | 4F : 96BO ( 48 bit ) 0012 : 36 FF FE 4F 96BO (64 bit)

3.Unique Local Address - FC00:: /7 - Unique in Global but used in Non-Routable Environment 4.Multicast Address - Used for Multicasting (Set of Addresses belong to different nodes) Loop back Address - 0:0:0:0:0:0:0:1 - ::1 Short Format : 0000 : 130F : 0000 : 0000 : 09CO : 876A : 130B : : 130F : : 9CO : 876A : 130B

QUESTIONS?