Module 6 - Manage Networking

Question 1

Four Layers of the TCP/IP Network Model

Answer 1

1) Application
2) Transport
3) Internet
4) Link

Question 2

Describe Application network model

Answer 2

Each application has specifications for communication so that clients & servers can communicate across platforms

Common protocols used:
SSH
HTTPS (secure web)
FTP (file sharing)
SMTP (electronic deliver)

Question 3

Describe Transport network model

Answer 3

TCP & UDP are transport protocols
* TCP is a reliable connection-oriented communication, whereas UDP is a connectionless datagram protocol
* Application protocols can use either TCO or UDP ports
* A list of well-known & registered ports is in the /etc/services file
 When a packet is sent on the network, the combination of the service port and IP address forms a socket
* Each packet has a source socket & a destination socket
* This information can be used when monitoring & filtering network traffic

Question 4

What is the file there a list of well-known & registered ports can be found?

Answer 4

/etc/services

Question 5

Describe Internet network model

Answer 5

The interlay layer, or network layer, carries data from the source host to the destination host
* The IPv4 & IPv6 protocols are internet layer protocols
* Each host has an IP address & a prefix to determine network addresses
* Routers are used to connect networks

Question 6

Describe the Link network model

Answer 6

The link layer, or media access layer, provides the connection to physical media
* Most common types of networks
o Ethernet (802.3)
o Wireless Wi-Fi (802.11)
* Each physical device has a Media Access Control (MAC) address, which is also known as a hardware address, to identify the destination of packets on the local network segment

Question 7

What are the two most common types of networks?

Answer 7

1) Ethernet (802.3)
2) Wireless Wi-Fi (802.11)

Question 8

What OSI models are included in the Application TCP/IP protocol?

Answer 8

1) Application
2) Presentation
3) Session

Question 9

What OSI models are included in the Transport TCP/IP protocol?

Answer 9

Transport

Question 10

What OSI models are included in the Internet TCP/IP protocol?

Answer 10

Network

Question 11

What OSI models are included in the Link TCP/IP protocol?

Answer 11

1) Data link
2) Physica

Question 12

What are examples & services of the Application TCP/IP protocol?

Answer 12

1) HTTP
2) HTTPS
3) FTP
4) Telnet
5) NTP
6) LDAP
7) DNS
8) DHCP
9) RIP
10) SIP
11) SMTP
12) SSH
13) TLS/SSL

Question 13

What are examples & services of the Transport TCP/IP protocol?

Answer 13

1) TCP
2) UDP

Question 14

What are examples & services of the Internet TCP/IP protocol?

Answer 14

1) IPv4
2) IPv6
3) ICMP
4) IGMP
5) IPsec

Question 15

What are examples & services of the Link TCP/IP protocol?

Answer 15

1) MAC
2) PPP
3) NDP
4) ARP Ethernet
5) Wi-Fi
6) DOCSIS
7) Tunnels

Question 16

What is the assignment of network interface names based on?

Answer 16

Information from the:

1) Firmware
2) PCI bus topology
3) Type of network device

Question 17

What do ethernet interfaces begin with?

Answer 17

“en”

Question 18

What do WLAN interfaces begin with?

Answer 18

“wl”

Question 19

What do WWAN interfaces begin with?

Answer 19

“ww”

Question 20

What does “oN” indicate?

Answer 20

An on-board device w/ the unique index of “N” from the server’s firmware

Question 21

What does “sN” indicate?

Answer 21

A device in PCI hotplug slot “N”

Question 22

What does “pMsN” indicate?

Answer 22

A PCI device on bus “N” in slow “N”

Question 23

What is the “w1p4s0” interface?

Answer 23

A WLAN card on PCI bus 4 in slot 0

Question 24

What function is an “enp0s1f0” interface?

Answer 24

Function 0 of the Ethernet card on bus 0 in slot 1

Question 25

What is persistent naming?

Answer 25

When the name of set for a network interface on the system, the name of the interface does not change, even if you add or remove hardware

Question 26

What is an IPv4 address?

Answer 26

A 32-bit number, which is expressed as four 8-bit octets in a decimal format that ranges in value from 0 to 255, separated by single dots

Question 27

What 2 parts is an IPv4 address divided into?

Answer 27

1) Network prefix
2) Host number

Question 28

What does a network prefix do?

Answer 28

Identifies a unique physical or virtual subnet

Question 29

What does a host number do?

Answer 29

Identifies a specific host on the subnet

Question 30

What does a network gateway do?

Answer 30

cCnnects different networks & a network router commonly operates as the gateway for a subnet

Question 31

What is a subnet?

Answer 31

A segment of a larger network, & the use of the term depends on the context

Question 32

What does “segment” refer to?

Answer 32

The physical or virtual link layer

Question 33

What does “subnet” refer to?

Answer 33

The logical, network-layer addressing for the corresponding segmen

Question 34

What class is 8 bits?

Answer 34

Class A

Question 35

What class is 16 bits?

Answer 35

Class B

Question 36

What class is 24 bits?

Answer 36

Class C