Lecture-09 - Lecture #09 Network Layer Objectives...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture #09 Network Layer Objectives Best-Effort Delivery End-to-End Functions robust delivery of packets end-to-end packet routing routing past failures scalability globally unique addressing adherence to layering abstraction (where possible) independent of data link layer hide details from transport layer Protocols Most common example is IP There are others but not worth covering Internet Structure: Network of Networks Tier-2 ISPs: smaller (often regional) ISPs Connect to one or more tier-1 ISPs, possibly other tier-2 ISPs Tier-2 ISP Tier-2 ISP Tier-2 ISP pays Tier-2 ISPs also peer rivately with Tier 1 ISP Tier 1 ISP Tier 1 ISP NAP Tier-2 ISP Tier-2 ISP Tier-2 ISP Tier-2 ISP tier-1 ISP for connectivity to rest of Internet b tier-2 ISP is c u s t o m e r of tier-1 provider privately with each other, interconnect at NAP Internet Structure: Network of Networks Tier-3 ISPs and local ISPs last hop (access) network (closest to end systems) Tier-2 ISP Tier-2 ISP local ISP local ISP local ISP local ISP Tier 3 ISP Local and tier- Tier 1 ISP Tier 1 ISP Tier 1 ISP...
View Full Document

Page1 / 12

Lecture-09 - Lecture #09 Network Layer Objectives...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online