WANs

1. The types and attributes of serial communication on WANs include.... PPP - Standard serial-line encapsulation. Performs tasks like checking link quality and giving a password option. HDLC - Derived from SDLC. HDLC is Cisco's default protocol and is very streamlined and efficient. It does not utilize things such as windowing. 2. WAN communications work by..... connecting LANs by means of a carrier network or a service provider. 3. The four different Wan connection types include... 1.HDLC - High-Level Data Link Control 2.Frame Relay - Simplified version of HDLC framing 3.PPP - Point-to-Point protocol 4.ISDN Integrated Service Digital Network(data-link signal) 4. The three different WAN encapsulation types covered in this lesson include... 1.LAPB - for packet-switched networks 2.Cisco/IETF- for frame relay traffic. Used only between Cisco routers. 3.HDLC-ISO standard. supports Point-to-Point and multipoint configurations. 5. WAN devices include.... Routers, WAN switches, CSU/DSU, and ISDN terminal adapters. 6. Some layer 1 WAN issues are:... Loose cords and bent pins. 7. Some layer 2 WAN issues are:... Incorrectly configured switches. 8. WAN services include... Communications beyond the geographic scope of a LAN.      WAN service Providers are...organizations that provide connectivity between LANs for profit.      WAN Subscribers include...anyone who uses a WAN service provider. Reflection In this lesson I learned...the basics of WANs and WAN technologies. This is important to network designers because...without WANs you could not communicate outside the geographic capacity of your LAN.