Module 2 / Unit 2 IPv4 Addressing Flashcards
On completion of this unit, you will be able to: □ Distinguish unicast, broadcast, and multicast addressing. □ Understand IP addressing schemes, including address classes, subnetting, classless addressing, CIDR, and VLSM. □ Identify address ranges for private networks. □ Configure an IP address scheme for a private network.
What technology or technologies can you use to isolate broadcast domains?
Routers and VLANs.
True or false? The IP address 172.24.0.1 is routable over the Internet.
False. 172.16.0.0 - 172.31.255.255 is the “Class B” private address range.
What is a “Class D” address?
One used for multicasting.
Which of the following are class C IP addresses? (Choose four) ○ 195.243.67.51 ○ 165.247.200.100 ○ 190.234.24.6 ○ 11001101 01110100 00000100 00101110 ○ 11001111 10000001 01111110 10010010 ○ 213.54.53.52 ○ 233.168.24.6
195.243.67.51 - TRUE
165.247.200.100 - FALSE
190.234.24.6 - FALSE
11001101 01110100 00000100 00101110 - TRUE
11001111 10000001 01111110 10010010 - TRUE
213.54.53.52 - TRUE
233.168.24.6 - FALSE
If a host is configured with the IP address 10.0.10.22 and mask 255.255.255.192, what is the broadcast address of the subnet?
10.0.10.63. To work this out, convert the IP to binary (00001010 00000000 00001010 00010110) then work out the number of bits in the mask (26). Change the remaining host bits (6) to 1s and convert back to dotted decimal
A host is configured with the IP address 10.0.10.22 and subnet mask 255.255.255.192. How many hosts per subnet would this addressing scheme support?
- To work this out, either subtract the least significant octet from 256 then subtract two for the network and broadcast addresses or having worked out that there are 6 host bits calculate (2^6)-2.
A technician is troubleshooting a network and has asked your advice. He is trying to ping 192.168.16.192. The network has been subnetted with the custom mask 255.255.255.224. Why might this return a “Destination host unreachable” message?
The IP address resolves to the subnet network address not a host address. Windows does not normally allow pinging the network address. Other OS treat it as an alternative broadcast address but most systems are configured to disallow such “directed” broadcasts for security reasons.
Which of the following IP addressing rules is true?
○
The host ID must be unique on the IP network
○
Network and host IDs cannot be all zeroes
○
A network ID can be any number
○
A network ID can be 255
The host ID must be unique on the network - TRUE
Network and host IDs cannot be all zeroes - TRUE
A network ID can be any number - FALSE
A network ID can be 255 - FALSE
If the IP address 10.0.10.22 were used with an /18 mask, how many subnets and hosts per subnet would be available?
1024 subnets each with 16,382 hosts. From the default mask, 10 bits are allocated to the subnet ID and 14 remain as host bits.
