Cisco Trimester3 Vocabulary & Questions Chapter 1

 

Vocabulary

 

Application Layer

ARP (Address Resolution Protocol)

Cisco IOS (Internetwork Operating System) software

Data link layer

Dtagram

Default route

Distance-vector routing protocol

Dynamic routing

EIGRP (Enhanced Interior Gateway Routing Protocol)

Flow Control

ICMP (Internet Control Message Protocol)

IGRP (Interior Gateway Routing Protocol)

IP address

MAC (Media Access Control)

Network

Network layer

NIC (network interface card)

Packet

SPF (shortest path first) protocol

Static routing

Stub network

Presentation

RARP (Reverse Address Resolution Protocol)

 

Questions

 

  1. List each of the layers of the OSI model and identify their function. Indicate what networking and internetworking devices operate at each of the layers. Be specific.

 

  1. By using layers, the OSI model simplifies the task required for two computers to communicate. Explain why.

 

  1. Each layer’s protocol exchanges information, called PDUs, between peer layers. How is this done?

 

  1. Each layer depends on the service function of the OSI reference model layer below it. The lower layer uses encapsulation to put the PDU from the upper layer into its data field; then it can add whatever headers and trailers the layer will use to perform its function. Explain the concept of encapsulation.

 

  1. The term Ethernet is often used to refer to all CSMA/CD LANs that generally conform to Ethernet specifications, including IEEE 802.3. The Ethernet and 802.3 data links provide data transport across the physical link joining two devices. Explain the meaning of Ethernet.

 

  1. IP provides connectionless, best-effort delivery routing of datagrams. It is not concerned with the content of the datagrams, but it looks for a way to move the datagrams to their destination. What is a datagram?

 

  1. ARP is used to map a know IP address to a MAC sublayer address to allow communication on a multi-access medium such as Ethernet. What is ARP and how does it work?

 

  1. Most routing protocols can be classified into one of two basic protocols: distance vector or link-state. What are the differences between the two types of protocols?

 

  1. Examples of IP routing protocols include RIP, IGRP and EIGRP. Explain the difference between these different types of protocols.