1. © Synergon Informatika Rt., 1999 Chapter 2 Introduction to Managing Traffic and Access

2. 2 Objectives Upon completion of this chapter, you will be able to perform the following tasks: Describe causes of network congestion List solutions for controlling network congestion

3. 3

4. 4 Traffic in an IP Network IP Network Sources of data and overhead traffic: l User applications l Routing protocol updates l Domain name server (DNS) requests l Encapsulated protocol transport

5. 5 Traffic in an IPX Network IPX Network Sources of data and overhead traffic: l User services l Routing protocol updates l Service Advertising Protocol (SAP) announcements l Client/server keepalive updates

6. 6. Traffic in an AppleTalk Network Sources of data and overhead traffic: l Name Binding Protocol (NBP) inquiries l Zone Information Protocol services l Routing protocol updates AppleTalk Network AppleTalk Network

7. 7 Traffic in a Multiprotocol Network Sources of data and overhead traffic: l All user application l All routing protocol updates l All overhead broadcasts and multicasts l All data link/physical layer signaling IP Network DNS FTP Watchdog ZIP IGRP SDLC SNMP GNS SAP ARP NBP Telnet IPX Network AppleTalk Network IP Network IPX Network AppleTalk Network Bandwidth of the link

8. 8 Managing Congestion Control network congestion by: l Filtering user and application traffic l Filtering broadcast traffic l Adjusting timers on periodic announcements l Providing static entries in tables l Prioritizing traffic

9. 9. Summary Traffic congestion is caused by the following: Bursts of user application traffic Multicast and broadcast traffic Too much traffic on low-bandwidth links Network design issues Traffic congestion can be overcome by: Filtering unwanted traffic Reducing the amount of overhead and broadcast traffic Prioritizing traffic for each serial link