Week 6 Notes

Question 1

Types of communication

Answer 1

Client-server
P2P
Hybrid

Question 2

Connection oriented

Answer 2

Reliable bitstream. Accomplished via TCP.
1. All data will be received in order. Effectively byte by byte transfer. Uses acknowledgement and retransmission.
2. Flow control- server won’t overwhelm end user.
3. Congestion control- if the network is congested, server will decrease send rate.

Question 3

Connectionless

Answer 3

Unreliable bitstream. Accomplished via UDP
1. Makes no gaurentees

Question 4

Services using connection oriented / TCP

Answer 4

HTTP, FTP, Telnet, SMTP

Question 5

Cost comparison of cable internet

Answer 5

More expensive in US due to more disbursed population leading to heavier reliance on level 1/2 carriers vs level 3 (access network) carriers.

Question 6

Residential DSL / ADSL (asymetric)

Answer 6

0 - 4 khz POT
4khz - 50khz upload
50khz - 1000khz downstream
Thus its asymetric
FDM

Question 7

Residential dial up

Answer 7

Used a dial up modem that maxed out at 56kbps in the ’90s.

Question 8

Residential cable internet access

Answer 8

Requires cable modem
FDM
30 mbps downstream
2 mpbs upstream

Question 9

Fiber to the home

Answer 9

ONT - optical network terminator
OLT - optical line terminator
PON - passive optical network
AON - active optical network
Optical splitter - 100x homes