1.0 NETWORK CONCEPTS

Question 1

A protocol that is connection-oriented, “Reliabel” delivery and has flow control ?

Answer 1

TCP (Transmission Control Protocol).
+ recovery from errors and manage out-of -order messages.
+receiver can manage how much data is sent.

Question 2

What protocol is connectionless, “Unreliable” delivery and no flow control?

Answer 2

UDP(User Datagram Protoco).
+ No formal open or close connection.
= No reording of data or retransmissions.
+Sender determines the amount of data transmitted.

Question 3

What is Non- ephemeral ports?

Answer 3

Permanent port numbers.
+Ports 0-1023.
+On server or service.

Question 4

What is Ephemeral ports?

Answer 4

Temporary port numbers.
+Ports 1024-65535.
+ real-time by the clients.

Question 5

What is SSH?

Answer 5

Secure shell.
+Port: tcp/22
+encrypted console login.

Question 6

What is DNS?

Answer 6

Domain Nmae System.
+Port: udp/53
+Convert domain names to IP addresses.

Question 7

What is SMTP?

Answer 7

Simple Mail Transfer Protocol.
+Port: tcp/25
+Transfer email between mail servers..

Question 8

What is SFTP?

Answer 8

Secure FTP.
+Port: tcp/22
+Secure file transfer.

Question 9

What is FTP?

Answer 9

File transfer porotocl.
+Port: tcp/20-21
+Sends and receives files between systems.

Question 10

What is TFTP?

Answer 10

Trivial File Transfer Protocol.
+Port: udp/69.
+A very simple file transfer applicaiton.

Question 11

What is Telnet?

Answer 11

Telecommunicaiton Network.
+Port: tcp/23
+Remote console login to network devices.

Question 12

What is DHCP?

Answer 12

Dynamic Host Configuration Protocol.
+Port: udp/67-68
-+Automated IP addressing and configuration.

Question 13

What is HTTP?

Answer 13

Hypertext Transfer Protocol.
+Port: tcp/80
-+Web server communication.

Question 14

What is HTTPS?

Answer 14

Hypertext Transfer Protocol Secure.
+Port: tcp/443
-+Web server communication with encryption.

Question 15

What is SNMP?

Answer 15

Simple Network Management Protocol.
+Port: udp/161.
-+Gather statistics and manage network devices.

Question 16

What is RDP?

Answer 16

Remote Desktop Protocol.
+Port: tcp/3389
+ Graphical display of remote device.

Question 17

What is NTP?

Answer 17

Network Time Protocol.
+Port: tcp/3389
+ Graphical display of remote device.

Question 18

What is SIP?

Answer 18

Session Initiation Protocol.
+Port: tcp/5060-5061
+ Voice over IP signaling protocol.

Question 19

What is SMB?

Answer 19

Server Message Block.
+Port: tcp/445.
+ Windows file transfer and printer sharing..

Question 20

What is POP3?

Answer 20

Post Office Protocol v 3.
+Port: tcp/110.
+ Receive mail into a mail client.

Question 21

What is IMAP4?

Answer 21

Internet Message Access Protocol v4.
+Port: tcp/143
+ A newer mail client protocol.

Question 22

What is LDAP?

Answer 22

Lightweight Directory Access Protocol.
+Port: tcp/389.
+ Communicate with network directories.

Question 23

What is LDAPS?

Answer 23

Lightweight Directory Access Protocol Secure.
+Port: tcp/636.
+ LDAP over SSL.

Question 24

What is H.323?

Answer 24

ITU Telecommunication H.32x protocol series.
+Port: tcp/1720
+Voice over IP signaling.

Question 25

OSI MODEL

Answer 25

Please Do Not Throw Sausage Pizza Away

Question 26

What layer is for signaling, cabling and connectors?

Answer 26

Physical Layer (1).

Question 27

What layer is the foundation of communication, “MAC” and switching?

Answer 27

Data Link Layer.

Question 28

What layer is “routing”, “IP” and Fragments frames to traverse different networks?

Answer 28

Network Layer.(3)

Question 29

What layer transfers information across the network and uses tcp and udp?

Answer 29

Transport layer.(4)

Question 30

What layer manages communication between devices, start, stop, restart, half-duplex, full-duplex, control protocols and tunneling protocols?

Answer 30

Session layer.(5)

Question 31

What layer character encodes, application encryption and often combined with the Application layer?

Answer 31

Presentation layer.(6)

Question 32

The layer that we see - HTTP, FTP, DNS AND POP3?

Answer 32

Application layer. (7)

Question 33

What is a MAC address?

Answer 33

Media Access Control.
+“physical” address to network adapter.
+Unique to device.
+ 48bits/6bytes long (hexadecimal).

Question 34

Which duplex cannot send and receive simultaneously?

Answer 34

Half-duplex.
+Lan Hubs.
+Switches can be configured to half-duplex as long as it is connected to and half-duplex device.

Question 35

Which duplex can send and receive at the same time?

Answer 35

Full-duplex.

Question 36

What operation listens for an opening and if a collision occurs what happens?

Answer 36

CSMA/CD OPERATIONS.
+Transmit jam signal bc of a collision has occurred.
+Random wait time and then retry.

Question 37

Common on wireless networks and collision detection isn’t possible?

Answer 37

CSMA/CA.
+Sending station can’t “hear” other stations.
+Common to see RTS/CTS.(ready/clear).

Question 38

Gathers, updates and builds list of MAC addresses? Maintains loop free enviroment?

Answer 38

Switch.

+Uses STP: Spanning Tree Protocol to maintain loop free enviroment.

Question 39

If a switch does not have MAC address in the table, what will it do?

Answer 39

Flooding for unknown MAC addressses.

+Sends frames to everyone.

Question 40

What is arp-a used for?

Answer 40

Address Resolution Protocol.
+Determine MAC address based on an IP address.
+arp-a = View local ARP table.

Question 41

You have one station sending info. to another station. What is this called.

Answer 41

Unicast.
+Web surfing, file transfers.
+Not optimal for streaming media.

Question 42

Information delivered to a interested systems is called.

Answer 42

Multicast.
+Multimedia delivery, stock exchanges.
+Difficult to scale on large networks.

Question 43

information that is being sent to everyone on network is called?

Answer 43

Broadcast.
+1 packet recived by everyone.
+Limited scope, Routing updates, ARP requests.
+Not used in IPv6.

Question 44

What is PDU?

Answer 44

Unit of transmission.

+A different group of data ta different OSI layer.

Question 45

What is MTU?

Answer 45

Maximum IP packet to transmit- but not fragment.
+Fragmentation slows things down.
+Difficult to know the MTU all the through the path.