1. (a) A block of 8192 addresses is available for allocation to hosts, starting with 192.24.0.0. The following organizations request addresses, Tithe an Oireachtais, An Post, and Raidió Teilifís Éireann. Tithe an Oireachtais need(s) 2048 addresses and is assigned 192.24.0.0/21. An Post needs 4096 addresses and is assigned 192.24.16.0 and the subnet mask 255.255.240.0. Finally, Raidió Teilifís Éireann asks for 1024 addresses and is assigned 192.24.8.0/22. (i) How many addresses are left after this allocation has been performed? (ii) If any addresses are available, give the network prefix for the available network. (iii) Give the first valid address and the last valid address of the available address space. [10 Marks]

An Internet Service Provider (ISP) is granted the block 90.70.56.0/21. The ISP needs to allocate addresses for two companies each with 510 addresses, two companies each with 250 addresses and 3 companies each with 60 addresses. of addresses in the ISP block. i. Find the range ii. Find the number of addresses allocated to each of the seven companies. iii. Find the range of addresses for each of the seven companies. iv. Find the range of unallocated addresses.

Q10: Complete the frames (x & y) given below with appropriate port, IP and MAC addresses. The sender Host E has two applications running; one for email with port number 49254 and the other for accessing the web server with port number 52167. The frame x is intended for the BRACU Web server and frame y is coming from the Email Server. (MAC addresses are alphabets and IP addresses are numbers) [5] Port 80 Frame y K/93 BRACU G/51 Router BRACU Web ISP Frame x Server Router I/91 Port 25 Н 52 F/25 Hub-PT Hubo A/20 Switc-PT Switcho Swich-Pr Syitch1 Email Server J/92 B/21 E/24 C/22 D/23 Sender Frame X D. Mac S. MAC D. IP S. IP D. Port S. Port Data Trailer Frame Y D. Mac S. MAC D. IP S. IP D. Port S. Port Data Trailer ** *******END***: *** *** *****

Assume a company has three offices: Central, East, and West. The company is granted a block of 64 addresses with the beginning address 70.12.100.128/26. The management has decided to allocate 30 addresses for the Central office and divides the rest of addressesbetween the two other offices equally. Design the subnets. (Find: Mask, Network and Broadcast address, First and last address, number of usable addresses in each network).

Q3: An organization is granted the block 16.0.0.0/8. The administrator wants to create 500 fixed-length subnets. a.) Find the subnet mask. b.) Find the number of addresses in each subnet. c.) Find the first and last address in subnet 1. d.) Find the first and last addresses in subnet 500.

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An organization is granted a block of addresses with the beginning address 14.72.128.0/23. The organization needs to have 3 subblocks of addresses to use in its three subnets as shown below: a.One subblock of 50 addresses. b.One subblock of 220 addresses. c.One subblock of 120 addresses. Design the subblocks and give the slash notation for each subblock. Find out how many addresses are still available after these allocations.

b) Given a network address of 198.132.26.0/24, efficiently assign addresses to the 3 subnets: Network A has 40 hosts, Network B has 30 hosts, Network C has 20 hosts. Assign addresses in A, B, C order as early as you can in the address space (assuming the networks will not get any more hosts). i) What are the three network addresses in / notation?

Answer the following: a) Rewrite the given IPv4 address using dotted-decimal notation and find the class. 01011110 10110000 01110101 00010101 b) Rewrite the given IPv4 address in binary representation and find the class.

An ISP is granted a block of addresses starting with 190.100.0.0/16 (65,536 addresses). The ISP needs to distribute these addresses to three groups of customers as follows: a. The first group has 64 customers; each needs 256 addresses. b. The second group has 128 customers; each needs 128 addresses. c. The third group has 128 customers; each needs 64 addresses. Design the subblocks and find out how many addresses are still available after these allocations. 19.29