Linux Networking

Question 1

Internet Control Message Protocol

Answer 1

Intended for networking equipment, routers, switches, firewalls, etc. for messages between. Often to query network device for available devices.
Ex: ping, traceroute

Question 2

IP Class ranges

Answer 2

RFC 1918

A B C D E

Question 3

Class A IP Range

Answer 3

Only 1 Contiguous Network
Range: 1-128
#hosts: 16,777,214
Mask: 255.0.0.0/8

Question 4

Class B IP Range

Answer 4

16 Contiguous Networks
Range: 128-191
#hosts: 65,534
Mask: 255.255.0.0/16

Question 5

Class C IP Range

Answer 5

256 Contiguous Networks
Range: 192-223
#hosts: 254
Mask: 255.255.255.0/24

Question 6

Class D IP Range

Answer 6

Range: 224-239
#hosts: Multicast (not host)

Question 7

Class E IP Range

Answer 7

Range: 240-254
#hosts: future use and research.

Question 8

Network Mask

Answer 8

Logical network (subnet). For Class A,B,C

Question 9

Private IP Address Range

Answer 9

Prevents need for every host to have IP Address from central authority, but not publicly routable.

Question 10

Private IP Address Ranges

Answer 10

10. 0.0.0 - 10.255.255.255. MaxHosts=16777216 CIDR=10.0.0.0/8
11. 16.0.0 - 172.31.255.255 MaxHosts=1048576 CIDR=172.16.0.0/12
12. 169.0.0 - 192.168.255.255 MaxHosts=65536 CIDR=192.168.0.0/16

Question 11

Network Gateway

Answer 11

Destination where network traffic goes that has no matching route not intended for local network

Question 12

Broadcast Address

Answer 12

IP Address needed to broadcast to all hosts on network. Ends with last octet containing 255.
Ex: 192.168.0.255 broadcast add. For 192.168.0.0/24

Question 13

/etc/services

Answer 13

File containing long list of network services, port info, and protocol.