Compare and contrast Ethernet vs WIFI networks
- Definition:
- Example:
- Recommendation:
- Reference:
Compare and contrast: WEP, WPA & WPA2
- Definition:
– WEP stands for Wired Equivalent Privacy. WEP is a security algorithm for the kind of IEEE 802.11 wireless networks. Introduced as part of the original 802.11 standard that is ratified in 1997. Its intention was to provide data confidentiality comparable to that of a traditional wired network. WEP is recognizable by key of 10 or 26 hexadecimal digits (40 or 104 bits)
– WEP was included as the privacy component of the original IEEE 802.11 standard that is ratified in 1997. WEP uses the stream cipher RC$ for confidentiality and the CRC-32 checksum for integrity.
- Reference: https://en.wikipedia.org/
What is a DNS server?
- Definition:
DNS server is a computer server, which contains database of IP addresses and their associated hostnames(e.g. google.com, yahoo.com). And it can translates hostname to IP address and IP address to hostname as well. Hostname is easier to remember for us, but computer/network devices can understand only IP address. So we need DNS server when we use internet.
- Example:
When you access to google.com, DNS server translate it to 172.217.9.238 and then you can access and use google website.
- Reference: https://www.lifewire.com
What is a DHCP server?
- Definition:
Every devices need IP address when they want to connect Internet. If users want to use always same IP address they have to contract service but, DHCP (Dynamic Host Configuration Protocol) device can create IP address quickly and automatically. It is create different address every each connect to network. DHCP is also used to configure the proper subnet mask, default gateway, and DNS server information on the device.
- Example:
Most Home Router contain DHCP device. A single computer is acted the DHCP server in large networks.
- Recommendation:
Devices like that exist predominantly in office environments, it’s impractical to assign them with an ever-changing IP address. For example, if a network printer has an IP address that will change at some point in the future, then every computer that’s connected to that printer will have to regularly update their settings so their computers will understand how to contact the printer.
- Reference:
Describe: a hub, a switch, a repeater, a bridge, a router
- Definition:
Ethernet hub allows you to have more ports in your router
A switch is a device in a computer network that electrically and logically connects together other devices. Multiple data cables are plugged into a switch to enable communication between different networked devices, and other name can be bridging hub.
A bridge it is nothing more than device which helps to connect two LAN network
Reapeater
It role is to repeat signal and make it stronger, so for example when you have big house one router is not enough so then you are buying repeater to have high signal of Wifi everywhere.
Routers are small electronic devices that join multiple computer networks together via either wired or wireless connections.It can work as everything that i showed upper
Define protocols: IP, DHCP, HTTP/HTTPS, FTP/FTPS, SMTP
- Definition:
– IP: Internet Protocol. The IP address you see—the one you’re connected to a network and the Internet with—is assigned to the computer you’re on. They are provided by the internet provider on limited time.
– DHCP: Dynamic Host Configuration Protocol (DHCP) is a client/server protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information.
– HTTP/HTTPS: Hyper Text Transfer Protocol Secure (HTTPS) is the secure version of HTTP, the protocol over which data is sent between your browser and the website that you are connected to. The ‘S’ at the end of HTTPS stands for ‘Secure’. It means all communications between your browser and the website are encrypted. HTTPS is often used to protect highly confidential online transactions like online banking and online shopping order forms.
– FTP/FTPS: File Transfer Protocol (FTP). File Transfer Protocol over SSL (FTPS). Allow two computers to transfer data over the internet. One computer acts as the server to store information and the other acts as the client to send or request files from the server.
– SMTP: The email server responsible for sending emails is called the SMTP (Simple Mail Transfer Protocol) server.
- Reference:
DHCP: https://technet.microsoft.com/
HTTP/HTTPS: https://www.instantssl.com/
FTP/FTPS: https://thwack.solarwinds.com/
What is a Firewall (either Personal Firewall or a Network Firewall)?
- Definition:
A firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.A firewall typically establishes a barrier between a trusted, secure internal network and another outside network, such as the Internet, that is assumed not to be secure or trusted.
What is a Proxy server? Is it the same or different to a Firewall?
A proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers.
Firewalls can block ports and programs that try to gain unauthorized access to your computer, while proxy servers basically hide your internal network from the Internet. It works as a firewall in the sense that it blocks your network from being exposed to the Internet by redirecting Web requests when necessary.
What is a Default Gateway? Is it also a Firewall or a Proxy server?
A default gateway in computer networking is the node that is assumed to know how to forward packets on to other networks. Typically, in a TCP/IP network, nodes such as servers, workstations and network devices each have a defined default route setting, (pointing to the default gateway), defining where to send packets for IP addresses for which they can determine no specific route. The gateway is by definition a router.
- Reference:
https://en.wikipedia.org/wiki/Proxy_server
https://en.wikipedia.org/wiki/Default_gateway
- Definition:
MAC means Media Access Control and are linked to the hardware of network adapters.It is the access control address of your network card. It is an unique address with 12 hexadecimal digits
- Example:
To find out the MAC address:
– On computers (Windows 7 – for example): go to Control Panel – Networking and Sharing Center- Local Area Connection 8 status – Details
– On Samsung (Android): From the standby screen, tap Apps. – Select Settings – Select About device – Select Status. – Scroll down to WiFi MAC address.
– On Windows phone (for example on Dean’s phone): go to Settings – System – About – More Info – MAC address: 80-XX-XX-XX-XX-XX
- Recommendation:
You can use MAC address to limit which computer you want to access your Wifi instead having a password to access the internet.
- Reference:
Compare and contrast: local (LAN) vs wide area network (WAN), Intranet vs Internet
- Definition:
LAN vs WAN: Local Area Network (LAN) is a computer network, which is limited to a small office,home , school. Typically a Local Area Network (LAN) is a private network owned and maintained by a single organization but Wide Area Network (WAN) is spans over multiple geographic locations, which is composed of multiple LANs. It use for company that they have two office at two different countries. Network Service Providers (also called as ISPs) provide the connectivity solutions for Wide Area Networks (WAN).
Compare and contrast
– LAN vs WAN: LAN is faster than WAN (1000 mbps vs 150 mbps)
– LAN have higher data transfer than WAN when compared with lAN
– LAN is cheaper than WAN cost per month
– LAN is safety than WAN
– WAN is useful for 3rd party in one internet cloud
- Example:
We use LAN for local internet like home or small office:
while WAN is for big companies that have many offices in different countries:
- Recommendation:
WAN should be faster than now because it is expensive than LAN
- Reference:
LAN vs WAN
Stella Pessoa 