1. Chapter 9 Internetworking
Internetworking Technology
System Network Architecture/Local Area Network Integration

2. Internetworking Technology
Bridging
Routing
Switching
Repeating

3. Bridging Equipment: bridges Operation 80/20 rule
Destination and source address
Known local nodes table
Forward-if-not-local
Broadcasting

4. Bridging - Pros & Cons Pros Cons Easy to install & configure
Quick & cost-effective
Between different network architectures
Different media types
providing repeating, retiming & regenerating
Cons
Propagation (all LANs)
Broadcast storm (improperly addressed frame)

5. Routing Equipment: routers Operation
Router is destination address of data link layer
Read network layer destination address
Use routing table to select the best path
Create new destination address (destination router) of data link layer
Forward-if-proven-remote

6. Routing - Pros & Cons Pros Cons More efficient use of bandwidth
Load balance (best path: hops, cost & congestion)
Dynamic routing table
Firewall (misaddressed or misbehaving frames)
Scaleable
Management information via SNMP
Multiple protocols
Cons
Complexity
Costs

7. Switching Equipment: switches Pros Cons Increase bandwidth
Virtual LANs
Cons
No filtering or security
Single path
Management problem (microsecond)

8. Repeaters Regenerating & retiming incoming digital signal
Pass all signals
Connect different media
Extend LAN distance

9. LAN-To-Mainframe
Hierarchical networks: Classic SNA (system network architecture)
Micro-Mainframe

10. Classic SNA Architecture
Front-end Processor (FED)
Cluster controller

11. FEPs - Functions Security Error checking Code converting
Line management
Message queue
Managing computer resources
Usage accounting

12. Cluster Controller
Similar to FEP
Low cost

13. Micro-Mainframe LAN-based SNA gateway
LAN server with protocol conversion software & hardware
Cost effective
Mainframe channel-attached gateway
Replace FEP
Cheaper

14. SNA Model Transaction service Presentation service Data flow control
Transmission control
Path control
Data link control Physical control

15. Assignment
Review chapters 8 - 9
Read chapter 13