Network Layer

Question 1

What problem the internet protocol helps resolve

Answer 1

Communication between multiple heterogenous networks

Question 2

Internet Protocol is best effort, meaning…

Answer 2

Delivery – packets may get dropped
Timing – no guarantee on time of delivery
order – packets may get reordered

Question 3

IPV4 Address has how many bits?

IPv6 how many

Answer 3

32 bits

128 bits

Question 4

In the subnet 255.255.0.0 which octets identify the host?

Answer 4

The bottom two

Question 5

Gateway construct is

Answer 5

a bridge between networks

Question 6

Describe the difference between routing and forwarding

Answer 6

Routing implies the path is computed by coordinating with neighbors, and creates the forwarding table, happens in the Control Plane

Forwarding directs a packet to an output port/link using the forwarding table, happens in the data plane

Question 7

Describe Lifecycle of packet when it reaches a router

Answer 7

Control plane needs to calculate forwarding table

-Data Plane Recieves at line card ingress

-lookup destination of forwarding table

-line card sends packet

Question 8

What does longest match prefix do?

Answer 8

Find most specific prefix that matches dest

Question 9

Example of a Link State proto

What is the basic idea of how it works?

Answer 9

OSFP

Each router peers with neighbors, finds shortest possible paths, finds reachable prefixes

Question 10

What is the primtive algorithm OSFP is based on?

Answer 10

Dijkstra’s

Question 11

BGP is an example of what kind of protocol?

Answer 11

Distance vector

Question 12

iperf3 measures…

Answer 12

network performance