client/server model. peer-to-peer network server-based network
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Client/Server Model
Peer-to-Peer Network
Workstation Workstation Workstation Workstation
Server-based Network
Client ServerC lient C lient
Bus Topology
Star Topology
C lient
Server
Ring Topology
Server
C lient
Star Bus Network
Bus TrunkCentralized Hub
Server
Client
Mesh Topology
Server
Client
OSI Model Layers
Packet Structure
Trailer
Data
Header
Application, Transportand Network Protocols
Local Area Networks
Wide Area Networks
Network Access Points
Networking Devices
Repeater
Bridge
Router
Gateway
CSU/DSU
Patch Panel
LAN Standardsand the OSI/RM
LLC and MAC SublayersDefined in IEEE 802.2
MAC Address Components
00 – 80 – 5F – EA – C6 – 10
Vendor Code Interface Serial Number
Token Ring Network with MAU
Client
Server
MultistationAccessUnit
FDDI StandardServer
DataFlow
DataFlow
C lient
Frame-Relay Packet Switching
The Internet Architecture
De-multiplexing
Port Numbers
IP Address Fields
• Contain 8 bits per field• Range from 0 to 255 decimal
field1.field2.field3.field4
1 1 1 1 1 1 1 1 = 8
128 64 32 16 8 4 2 1 = 255
1 = On0 = Off
Resolving IP Addressesto Ethernet Addresses
I P address (32-bit)
Ethernet address (48-bit)
DHCP Initialization Process
Typical RemoteConnectivity Solution
Security Modelsand Authentication
text
Peer-levelAccess
User-levelAccess
Peer-to-PeerNetwork Security Model
Athena Aphrodite Hermes
Apollo Ares
Printer
User-based Network
Athena Aphrodite Hermes
AresApollo
User AccountsDatabase
Printer A
Printer B
User Accounts Databaseand User Permissions
Flow of a Print Task
Disk Striping
Disk Mirroring
Disk Stripingwith Large Blocks
Disk Striping with Parity
Symmetric-Key Encryption
Public-Key Encryption