Week 9 Quiz

Question 1

Before the introduction of CIDR in 1993, IPv4 addresses were allocated in classes. What were the classes and the subnet mask lengths?

Answer 1

Class A - /8, Class B - /16, Class C - /24

Question 2

NAT stands for

Answer 2

Network Address Translation

Question 3

IP addresses are allocated from the Internet Assigned Numbers Authority (IANA) to (Regional Internet Registries), then to Service Providers and then to customers. Which organisations have currently run out of IPv4 addresses for new customer allocations

Answer 3

IANA, the RIRs (though reclaimed addresses maybe available) and some Service Providers.

Question 4

What are the address ranges allocated in RFC 1918

Answer 4

10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16

Question 5

When can RFC 1918 addresses be routed on the internet

Answer 5

They should never be routed on the internet

Question 6

When using a NAT device, TCP connections are

Answer 6

passed through the gateway with addresses/ports changed

Question 7

When using an Application Level Gateway (ALG), TCP connections are

Answer 7

their use depends on the application protocol

Question 8

TCP Congestion Avoidance means

Answer 8

slowly increasing the sending rate until loss occurs

Question 9

TCP slow start involves

Answer 9

exponentially increasing of the congestion window

Question 10

Slow start doubles the congestion window every

Answer 10

RTT Round trip time

Question 11

The traceroute tool expects what type of response packet

Answer 11

ICMP time exceeded

Question 12

The ping tool expects what type of response packet

Answer 12

ICMP echo reply

Question 13

Firewalls are often placed within a network to block attacks and unwanted traffic. Where are firewalls commonly placed within an organisation?

Answer 13

between the network and the Internet
on each host
between a bring-your-own-device network and other networks
between an internal network and public facing servers run by the same organisation