Answers
Miscellaneous Questions
1. longest prefix, sliding window
2. Request
3. DHCP ("Configuration" is vague, sorry)
4. Ethernet, IP, TCP, HTTP
5. 256
6. Control processor of each router
7. head of line blocking
8. E2E
9. F
10. 1Mbps, 3.66Mbps, 3.66Mbps, 3.66Mbps

Design Decisions
1. 1,4, and 5
2.1 easier
2.2 harder
2.3 doesn't matter
2.4 doesn't matter
2.5 easier

HTTP/Caching
2 files, 1 Mb each; RTT = 10msec= 0.01sec; bw = 10Mbps
a.1
4 RTT (2 SYN/ACK, 2 Data/ACK) + 2 Transmission time
= 4*0.01sec + 2*(1Mb/10Mbps) = 0.04 + 0.2 = 0.24 sec
a.2
2 RTT (1 SYN/ACK, 1 Data/ACK) + 1 Transmission time at half transmission speed
= 2*0.01sec + (1Mb/5Mbps) = 0.02 + 0.2 = 0.22 sec
a.3
3 RTT (1 SYN/ACK, 2 Data/ACK) + 2 Transmission time
= 0.03 + 0.2 = 0.23 sec
a.4
2 RTT (1 SYN/ACK, 1 Data/ACK) + 2 Transmission time
= 0.02 + 0.2 = 0.22 sec

b.1
same as a.1 = 0.24 sec
b.2
2 RTT (1 SYN/ACK, 1 Data/ACK) + 1 Transmission time at full transmission speed
= 2*0.01sec + (1Mb/10Mbps) = 0.02 + 0.1 = 0.12 sec
b.3
same as a.3 = 0.23 sec
b.4
same as a.4 = 0.22 sec

c.1
2 CB RTT (SYNACK, Data/ACK) + 1 AC Trans. + 1 CB Trans
= 2*0.01 + (1Mb/1Gbps) + (1Mb/10Mbps) = 0.121 sec
c.2
1 AC Trans
= (1Mb/1Gbps) = 0.001 sec
c.3
2 CB RTT + 1 AC Trans
= 0.021 sec
c.4
same as c.1 = 0.121 sec

Wireless
a.1 yes
a.2 no
a.3 no

b.1 no
b.2 yes
b.3 no

Load Sensitive Routing
Not stable, route will oscillate between A-B-D and A-C-D.

BGP
a B-C-E
b A-D-E, D could have many router hops inside it.
c D-B-C-E
d A-B-C-E
e No, not valley free, E won't advertise D.