Midterm study guide - Hsanokklis/2022-2023-Tech-journal GitHub Wiki

This assignment is just a reminder to study. The test will be a combination of short answer, multiple choice, use of some simple computer commands, reviewing a simple Wireshark capture, and a simple Packet Tracer activity.

It is closed notes and will cover the following topics:

  • 4 common LAN Topologies
  • Physical Address (aka MAC Address)
  • Command to view IP configuration in Windows
  • OSI Model layers
  • Role of a "router"
  • Network Hub
  • Network Switch
  • Broadcast Domain
  • Default Gateway
  • Purpose and function of ARP
  • IPv4 Addresses
  • Role of subnet mask
  • Simple subnetting
  • Selecting the correct subnet mask
  • Identifying the Network Address (all 0's in Host ID)
  • Identifying the Broadcast Address (all 1's in the Host ID)
  • Identifying useable host ranges in a subnet
  • Reserved "private" IP addresses

192.168.0. 0

172.16-31.0.0

10.0.0.0

  • Using ping to test connectivity
  • Parsing a Wireshark Capture to find the MAC Addresses and IP Addresses in a Packet
  • Building a simple LAN in Packet Tracer

which of follow are reserved

run command to identity MAC address

match the following (layers,application, network, data link)

routers operate at layer they make their design on a certain address (Ipv4 network address)\

switches are layer 2 devices they connect to a star use tables of MAC addresses configuration - physical ports on the switch

what is the broadcast address for layer two

the most common of the 4 standard toplogies

if it is a switch it will make a direct point point

153.104.21.10/23 what is the network address 153.104.20.0

which later of OSI deals with the physical network interface

what is a subnet mask

mac address what layer and are how many bits/bytes/ identified OUI

Mid Review:

  • Match topology
  • Pick out private IP addresses 192.168, 10, 172.16-31
  • Command to locate the physical address of a workstation
  • Match the following OSI Layers
  • Routers operate at what layer of the OSI model and use what address
  • What device layer is a switch on, and what addressing tables do they use?
  • Broadcast addresses for layer 2
  • Questions about switches
  • A picture with a switch or hub and computers asking about the photo and who will be notified by a broadcast
  • What is the Network Address for the IP address 153.104.21.10 /23 (even .20.0)
  • ___ is a protocol used by systems to determine the MAC address of another system on the same network (ARP)
  • Match subnet mask to the proper CIDR notation (convert subnet to binary, then binary to CIDR)
  • Which layer of the OSI model works with the network interface?
  • Local distant question: Source and destination MAC and IP
  • Which of the following is a valid MAC address
  • Subnet Mask (True or False Q) (probs false because subnets are 32bit, not 48)
  • MAC addresses fill in the blank questions (block ID?)
  • IPv4 fill in the blank questions
  • LAN networks with two subnets fill in the blank questions (broadcast address highest address available, default gateway, assume arp cache is empty)
  • Given 156.104.16.0/22, answer fill in the blanks (pay attention to subnet)
  • Testing connectivity, two possible answers (ping or traceroute)
  • Ping (look at the correct packets
  • Using Packet Tracer to make a LAN, cover 2 areas North and South, 4 subnets for Sales and Finance (In North), and Marketing and Engineering (In South)

Please create a mind map sub the below material.

How to create a Mind Map

This is a study guide and reminder to review the following for the quiz!

  • 7 Layers of OSI Model

image

  • Common Network Topologies (Bus, star, ring...)
  • Format of MAC addresses
  • Role of MAC addresses
  • Hubs and Switches
  • What ARP is for

The Address Resolution Protocol is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite

  • How ARP works (basic)
  • The role of the Default Router/Default Gateway

The default gateway is the path used to pass information when the device doesn't know where the destination is. More directly, a default gateway is a router that connects your host to remote network segments. It's the exit point for all the packets in your network that have destinations outside your network.

  • ARP and the Default Gateway
  • ARP and Broadcast Domains

Quiz will be a combination of multiple choice and short answer

Essay Question: Please briefly describe what ARP does on the LAN. Be very specific in your writing to show that you fully understand what ARP is and how it works.

  • know someone's IP but not MAC

  • send broadcast out to everyone

  • determine whether its on a local or distant address, know whether to ARP directly to the IP address or to the default gateway(if you are pinging google, which is 8.8.8.8, is not on the local LAN)

  • Check your ARP cache before you ARP for anything(Check if the IP address you get are in your ARP cache)

What are the 4 Topologies

What is the most commonly used networking topology?

  • star

what addressing is used at the data link layer

  • MAC address

What layers do NIC work at?

  • physical and data link (because 1 can only talk to 2)