Chapter 2

"Do I Know This Already?"

1.B
2.C
3.A
4.B
5.A
6.C
7.C
8.A
9.C
10.C
11.D

Q&A

1.181 = 1011 0101

202 = 1100 1010

152 = 1001 1000

109 = 0110 1101

2.10101111 = 175

10000001 = 129

00111100 = 60

01001001 = 73

3.1100 0000 . 1010 1000 . 0000 0000 . 0000 0001
4.12.150.146.181 is Class A, 150.159.216.202 is Class B, 209.209.158.152 is Class C, and 224.137.116.109 is Class D (Multicast)
5.A (255.0.0.0), B (255.255.0.0), C (255.255.255.0)
6./24 includes 32–24 = 8 host bits. 28–2 = 254 host addresses.

/27 has 5 host bits, for 30 host addresses

/20 has 12 host bits, or 4094 host addresses.

7.24.177.78.62/27 includes 24.177.78.33–63

135.159.211.109/19 includes 135.159.192.1–135.159.223.254

207.87.193.1/30 includes 207.87.193.1 and 2.

8.192.168.160.0/21
9.172.30.31.0/24, 172.30.32.0/22, 172.30.36.0/23, 172.30.38.0/24
10.Answer:
  • Hides network details and protects against flaps

  • Reduces router CPU and memory consumption

  • Saves network capacity



 
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