chapter 1- Computer Networks and the Internet

Question 1

What is the Internet (nuts and bolts view)?

Answer 1

interconnected devices communicating via standard protocols

Question 2

What is the Internet (services view)?

Answer 2

platform that provides services to applications like email, web, ..l.

Question 2

What is a packet switch?

Answer 2

device that forwards chunks of data (packets)

Question 3

What is a protocol?

Answer 3

set of rules defining actions upon sending/receiving

Question 4

What is an ISP(Internet Service Provider)?

Answer 4

connects users to the Internet

Question 5

What is HFC?

Answer 5

Hybrid Fiber Coax – fiber to the street, coaxial cable into homes

Question 6

What is DSL?

Answer 6

Digital Subscriber Line – telephone wires for Internet access

Question 7

What’s the difference between WLAN and cellular networks?

Answer 7

WLAN is short-range (e.g., WiFi); cellular is long-range (e.g., 4G/5G)

Question 8

What’s a data center network?

Answer 8

Connects servers to each other and the Internet

Question 9

What is a network protocol?

Answer 9

governs how devices communicate across the network

Question 10

What is the network core?

Answer 10

interconnected routers and links that forward packets from source to destination

Question 11

What is IP spoofing?

Answer 11

Sending a packet with a fake source address

Question 12

How do we defend against spoofing?

Answer 12

Authentication – verifying identities