Module 6 - Manage Networking Flashcards
Four Layers of the TCP/IP Network Model
1) Application
2) Transport
3) Internet
4) Link
Describe Application network model
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)
Describe Transport network model
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
What is the file there a list of well-known & registered ports can be found?
/etc/services
Describe Internet network model
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
Describe the Link network model
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
What are the two most common types of networks?
1) Ethernet (802.3)
2) Wireless Wi-Fi (802.11)
What OSI models are included in the Application TCP/IP protocol?
1) Application
2) Presentation
3) Session
What OSI models are included in the Transport TCP/IP protocol?
Transport
What OSI models are included in the Internet TCP/IP protocol?
Network
What OSI models are included in the Link TCP/IP protocol?
1) Data link
2) Physica
What are examples & services of the Application TCP/IP protocol?
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
What are examples & services of the Transport TCP/IP protocol?
1) TCP
2) UDP
What are examples & services of the Internet TCP/IP protocol?
1) IPv4
2) IPv6
3) ICMP
4) IGMP
5) IPsec
What are examples & services of the Link TCP/IP protocol?
1) MAC
2) PPP
3) NDP
4) ARP Ethernet
5) Wi-Fi
6) DOCSIS
7) Tunnels
What is the assignment of network interface names based on?
Information from the:
1) Firmware
2) PCI bus topology
3) Type of network device
What do ethernet interfaces begin with?
“en”
What do WLAN interfaces begin with?
“wl”
What do WWAN interfaces begin with?
“ww”
What does “oN” indicate?
An on-board device w/ the unique index of “N” from the server’s firmware
What does “sN” indicate?
A device in PCI hotplug slot “N”
What does “pMsN” indicate?
A PCI device on bus “N” in slow “N”
What is the “w1p4s0” interface?
A WLAN card on PCI bus 4 in slot 0
What function is an “enp0s1f0” interface?
Function 0 of the Ethernet card on bus 0 in slot 1
What is persistent naming?
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
What is an IPv4 address?
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
What 2 parts is an IPv4 address divided into?
1) Network prefix
2) Host number
What does a network prefix do?
Identifies a unique physical or virtual subnet
What does a host number do?
Identifies a specific host on the subnet
What does a network gateway do?
cCnnects different networks & a network router commonly operates as the gateway for a subnet
What is a subnet?
A segment of a larger network, & the use of the term depends on the context
What does “segment” refer to?
The physical or virtual link layer
What does “subnet” refer to?
The logical, network-layer addressing for the corresponding segmen
What class is 8 bits?
Class A
What class is 16 bits?
Class B
What class is 24 bits?
Class C
