CCNA 200-301 Chapter 3-Fundamentals of WANs and IP Routing.pptx
- 1. CCNA 200-301, Volume I Chapter 3 Fundamentals of WANs and IP Routing
- 2. Objectives • Leased Line WANs • Ethernet as a WAN technology • Accessing the Internet
- 3. Small Enterprise Network with One Leased Line
- 4. Conceptual View of the Leased-Line Service
- 5. Different Names for a Leased Line Name Meaning or Reference Leased circuit, Circuit The words “line” and “circuit” are often used as synonyms in Telco terminology; circuit makes reference to the electrical circuit between the two endpoints. Serial link, Serial line The words “link” and “line” are also often used as synonyms. “Serial” in this case refers to the fact that the bits flow serially, and that routers use serial interfaces. Point-to-point link, Point-to-point line These terms refer to the fact that the topology stretches between two points, and two points only. (Some older leased lines allowed more than two devices.) T1 A specific type of leased line that transmits data at 1.544 Megabits per second (1.544 Mbps). WAN link, Link Both these terms are very general, with no reference to any specific technology. Private line This term refers to the fact that the data sent over the line cannot be copied by other telco customers, so the data is private.
- 6. Possible Cabling Inside a Telco for a Short Leased Line
- 7. HDLC Framing
- 8. IP Routing Logic over LANs and WANs
- 9. General Concept of Routers De- encapsulation and Re-encapsulating IP Packets
- 10. Fiber Ethernet Link to Connect CPE Router to a Service Provider’s WAN
- 11. EoMPLS Acting like a Simple Ethernet Link Between Two Routers
- 12. Routing over an EoMPLS Link
- 13. Routing Logic: PC1 Sending an IP Packet to PC2
- 14. Network Layer and Data-Link Layer Encapsulation
- 15. IPv4 Header, Organized as 4 Bytes Wide for a Total of 20 Bytes
- 16. Example of How Routing Protocols Advertise About Networks and Subnets
- 17. Basic DNS Name Resolution Request
- 19. Sample Network, ping Command