IPv4 concepts

IPv4 Concepts Review

Multiple Choice

Which step is the first step in troubleshooting a network-related problem in a small to medium-sized business?

• Question end-users on what they see is the problem

• Identify the number of users affected by the problem

• Run a network test

• Identify the problem

Multiple Choice

You are a network technician working on a number of calls for small businesses and you realize you are going to be late to your next call. What is the best course of action?

• wait until you arrive and then apologize

• cancel the appointment

• offer the customer a discount on services

• call the customer to let them know you are running behind schedule

Command-line tools

DHCP= Dynamic Host Configuration Protocol. Provides IP addresses for clients connecting to a network

ipconfig=returns IP address information for each network adapter on a device

ipconfig/all=displays both IP address information and DHCP server information

ipconfig/release=releases IP address-lose network connectivity

ipconfig/renew=trying to obtain an IP address

Command-line tools continued

ipconfig/flush= empties the DNS (Domain Name System) cache

ipconfig/?=displays all possible options for the ipconfig command

ping-used to see if you can reach a destination (4 responses)

ping-t=run when you want more than 4 responses

CTRL+C=stops pinging

ping-n=the number of times you want to ping (ping-n8, ping-n5)

ping-t and ping-n are used when you need a larger sample size of pings

Multiple Choice

Which command-line tool is used to display IP address information and, where applicable, DHCP server information?

• ping

• ping-d

• ipconfig

• ipconfig/all

IPv4 Address Classes

​Class	​IP Address Range (first number)	Size	Subnet Masks	Private IP range
​A	​1-126	approx. 16 million devices on 1 network	255.0.0.0	10.0.0.1-10.255.255.255
​B	​128-191	65,000 devices	255.255.0.0	172.16.0.0-172.31.255.255
​C	​192-223	254 devices	255.255.255.0	192.168.0.0-192.168.255.255
D	224-239	​	​	Used for multicast
E	240-255	​	​	Experimental/research
Broadcast address for all devices	​	​	255.255.255.255	​

Match

Match the following

• Class A

• Class B

• Class C

• Class D

10.123.12.1

130.34.3.223

199.11.221.4

224.2.200.35

• 10.123.12.1

• 130.34.3.223

• 199.11.221.4

• 224.2.200.35

Multiple Select

You must manually configure a computer with an IP address on the same network as a router. The router's interface is configured as 192.168.1.100 with a subnet mask of 255.255.255.0. Which two options are valid IP addresses you could assign the computer?

• 192.168.1.5

• 192.168.0.10

• 192.168.1.254

• 192.168.1.255

• 192.168.1.100

Multiple Choice

You need to set up 750 computers on the same network. Which IP class is the best option?

• Class A

• Class C

• Class D

• Class B

Multiple Choice

You need to subnet a 192.168.1.0 network using a class C network. What is the subnet mask?

• 255.255.255.255

• 255.255.255.0

• 255.255.0.0

• 255.0.0.0

Multiple Choice

You need to set up 200 computers on a Class A private network. Which of the following network IDs meet all the criteria for a Class A private network?

• 10.0.0.0

• 192.168.1.0

• 172.168.0.1

• 100.10.1.0

​IPv4 Address Types

​Range	​Type	​
​75.0.0.0-75.255.255.255	​Public Network Addresses	used on the Internet. Typically assigned by the ISP
​192.168.0.0-192.168.255.255	​Private Network Addresses	Used on internal networks only. NOT used on the Internet
224.0.0.0-239.255.255.255	Multicast Addresses	​

​When a device on the internal network accesses the internet, that data traffic is sent using the public IP address.

Because private IP address are never used on the Internet, users in one private network can have the same IP address as users in another private network

Match

Match the following

• Public Network Addresses

• Private Network Addresses

• Multicast Network Addresses

75.0.0.0-75.255.255.255

192.168.0.0-192.168.255.255

224.0.0.0-239.255.255.255

• 75.0.0.0-75.255.255.255

• 192.168.0.0-192.168.255.255

• 224.0.0.0-239.255.255.255