5D Flashcards
What does HTTP stand for?
Hyper Text Transfer Protocol
What is HTTP?
HTTP is a protocol that allows you to browse websites using a web browser.
What layers does HTTP operate in the OSI model?
HTTP operates in the Application, Presentation, and Session layers of the OSI Reference Model.
What does FTP stand for?
File Transfer Protocol
What is FTP?
File Transfer Protocol is a method of transferring data files from one computer to another over a network.
Which protocol is the most basic way of sending and receiving files over internet?
FTP
FTP divides files into several ____ and assigns a reference number to each one. These segments are transmitted in a ____ which the receiving computer reassembles as an exact copy of the original. FTP also performs automatic _________ and correction in file transfers.
Segments, sequence, error detection
What does SMTP stand for?
Simple Mail Transfer Protocol
What is SMTP?
SMTP is used to transfer e-mail messages and attachments.
What layer does the SMTP operate at?
SMTP operates in the Application, Presentation, and Session layer of the OSI reference model.
What does IP stand for?
Internet Protocol
What is IP?
IP is the basis for all addressing on TCP/IP networks and provides a connectionless-oriented network layer protocol.
IP operates at which layer of the OSI model?
Network layer
For devices to communicate on the network, they must be configured
with a ___________.
valid IP address
What does SNMP stand for?
Simple Network Management Protocol
What is SNMP?
A set of protocols created to permit remote monitoring and management of devices and hosts
What layer does SNMP operate at?
SNMP operates in the Application, Presentation, and Session layers of the OSI Reference model
What are packet sniffers?
Examples of SNMP protocols. They can monitor and log the individual packets that travel along your network. Packet sniffers can watch for specific types of problems and provide analysis of the packet.
What does DNS stand for?
Domain Name System
What does DNS do?
DNS provides a friendly name to IP address on the internet. It lets you use a name rather than numbers to refer to host computers.
What does RIP stand for?
Routing Information Protocol
What does RIP do?
(RIP) uses broadcast UDP data packets to exchange routing
information.
Cisco software sends routing information updates every 30 seconds, which is termed _____.
advertising
If a device does not receive an update from another device for 180 seconds or more, the receiving device marks the routes served by the non-updating device as _________.
unusable
If there is still no update after 240 seconds, the device….?
Removes all routing table entries for the non-updating device.
RIP Request messages are sent to UDP destination
port _____.
520
How many versions of RIP are there?
Two
What is the difference between RIPV1 and RIPV2?
The Cisco implementation of RIP Version 2 (RIPv2) supports plain text and message digest algorithm 5 (MD5) authentication, route summarization, classless interdomain routing (CIDR), and variable-length subnet masks (VLSMs).
What does DHCP stand for?
Dynamic Host Configuration Protocol
What does DHCP do?
DHCP is a protocol for automatically assigning dynamic IP addresses to devices on a network. Dynamic addressing allows a device to have a different IP address every time it connects to the network.
True or False - In some systems, the device’s IP address can change while still connected and operating.
True
How does DHCP simplify network addressing?
Because the software keeps track of IP addresses rather than requiring an administrator to manage the task. This means that a new computer can be added to a network without the hassle of having to manually assign it an IP address.
What does ARP stand for?
Address Resolution Protocol
What does ARP do?
It is a telecommunications protocol used for “resolving” (converting) the network layer (IP) address into a link layer address (MAC).
What layer does ARP operate at?
Network
What is a port?
A port is a virtual path to send and receive data from computers.
Computers have how many ports?
65,535
The “purpose” for which the port is used for is called a _______.
service
Virtual ports are used to….?
communicate between two different applications
_____ is responsible for maintaining the official assignments of port numbers for specific uses.
IANA (Internet Assigned Numbers Authority)
Ports are divided into what three ranges?
Well-known, registered, dynamic/private/ephemeral
Well-known ports are numbers that range from?
0-1023
Well-known ports are assigned to what?
Common protocols and services and provide widely used types of network services for system processes.
Registered ports are numbers that range from what?
1024-49151
Registered ports are assigned what?
They are assigned by IANA for specific application services used by a requesting entity.
Dynamic/Private/Ephemeral ports are numbers that range from what?
49151-65535
Dynamic/Private/Ephemeral ports are assigned what?
This range is used for custom or temporary purposes and for automatic allocation of ephemeral (temporary) ports. They are assigned as needed then released when the service is finished. In this case a service might have a different port assigned every time it’s used.
Ports ranging from 49152–65535 are the dynamic or private ports that cannot be registered with _____.
IANA
What are the two statuses that ports can have?
Open and closed
