What are the three parts of basic router operation?
- reception of packets on physical interface
- processing and routing of packets
- transmission of packets on the next interface
What are the four parts of packet reception?
- router receives layer one bits and associated layer 2 frame
- performs CRC on received frame
- stores packet for further processing
- destroys Layer 2 framing bits
What are the five parts of processing and routing packets?
- router verifies the IP header checksum
- locates DA address
- does routing table lookup and identifies next physical interface
- decrements the TTL
- recalculates a new IP header checksum
What are the two parts of transmitting packets?
- router processes Address Resolution Protocol (ARP) as needed
- router encapsulates IP in a new layer 2 frame
What is the order of priority for preferred route selection? (Based on DA)
- Network
- Direct
- Host specific
- Subnet specific
- Network specific
- Default
What are 3 non-valid DA numbers?
10.0.0.0
10,x,y,0
127.0.0.0
What is another name for Internet Routing Protocol?
Exterior Gateway Protocol
What are 2 internet routing protocols?
- EGP v1/v2
- BGP v3/v4
What is another term for Autonomous System Routing Protocol?
any Interior Gateway Protocol
Name 6 autonomous system routing protocols.
- BGP v3/4
- RIP v1/2
- IGRP
- EIGRP
- OSPF
- IS-IS ISO
What is a border router?
One that interfaces with the Internet.
What networks typically use IGP? What is IGP?
Interior Gateway Protocol. Used by: internet, intranet, enterprise network, private network, autonomous system network
What is RIP? What algorithm does it use?
Routing Information Protocol. Distance Vector State.
What is IGRP? What algorithm does it use?
Interior Gateway Routing Protocol (Cisco). Cisco IGP Distance Vector State.
What is EIGRP? What algorithm does it use?
Enhanced Gateway Routing Protocol (Cisco). Cisco IGP Hybrid Distance Vector and Link State
What is OSPF? What algorithm does it use?
Open Shortest Path First. Link State.
What is IS-IS?
Intermediary System to Intermediary System
T/F: a router may support multiple routing protocols.
T
What are the two types of routing protocols routers support?
- Internet routing protocols
- Autonomous system routing protocols
What protocol does the Internet impose?
EGP or BGP
T/F: Autonomous systems may communicate with each other and communicate via the Internet.
True
