Book C1 (Networks) Flashcards
Difference between client server and P2P network
- Different set-up / maintenance costs
- Consistency of resources
- Whether dedicated software is required
- Security (server admin.)
What is a NIC?
Connects a device to a network and has a MAC address
What is an AP?
- Connects to a wired LAN
- Provide wireless connection to form a wireless LAN
- SSID name = name of WiFi that shows up in the phone
What is a switch?
- Connects devices to create a LAN
- Directs data to destination based on the MAC address
- Data buffering prevents data collision
What is WiFi roaming?
It means when a person is moving, the NIC of the phone will disconnect the original AP when out of reach to connect to a new AP automatically
What is a router?
- Connects LANs together to form a WAN
- Forwards data based on their IP address
- Common mistake: switch does not forward data, only sorts it towards the address
What is a modem?
- Converts analog signals from the internet and the digital signals from the computers and connects networks to the internet
types of DSL modems
- Asymmetric DSL = download speed > upload speed (for households)
- Symmetric DSL = download speed = upload speed (corporate use)
Difference between UTP / STP / Fibre optic cable
- Cost
- Connection distance
- Transmission speed
- Affect of electromagnetic interference
Difference between satellite / microwave / WiFi / Bluetooth
- Whether it will be affected by bad weather
- Whether it will be affected by walls
- Use of radio / microwave frequencies
- Distance
- Transmission speed
Difference between 2.4GHz and 5GHz
- Transmission speed
- Range
- Radio interference
Difference between broadband connection / leased line / mobile data / wifi hotspots
- Connectivity (wired/wireless)
- bandwidth
- cost
- security
- availability
Steps of sending data over
- TCP divides data into data packets for transmission, the packets are numbered and sent one by one, then when it arrives to the destination. Then the TCP will reassemble the recieved packets.
- IP adds a destination address to each packet and selects the best path to the destination to avoid congestion
What protocols are on the application layer?
HTTP/FTP/SMTP/POP/IMAP/WWW/HTML/Browser
What protocols are on the transport layer?
TCP
What protocols are on the network layer?
IP
What protocols are on the data link layer?
ARP (linking things to the MAC and IP address)
What protocols are on the physical layer?
Ethernet/802.11 WiFi
What is encapsulation?
Process of adding a header or trailer to the data
Features of IPv4
32-bit address, with four 8-bit numbers / no. of available addresses = 2^32 / range from 0-255
Feattures of IPv6
128-bit address with eight 16-bit numbers / no. of available addresses = 2^128 / separated by a : / range from 0-F
SMTP, IMAP and POP3
- SMTP is for sending emails
- IMAP and POP3 are for retrieving emails
- POP3 gives users one mailbox and stores emails on local computers so users can view w/o internet. By default, POP3 will delete the emails once downloaded to free storage.
- IMAP keeps emails in the server, and allows multiple clients to use the same mailbox. Users accesses the server with internet connection, and it synchs the emails.
To / Cc / Bcc meanings
To = require attention or action in response to email
Cc = Send a copy of the email to the recipients to notify them
Bcc = Send a copy to recipient without letting others know (privacy)
Attatchments, inline embedding and hyperlinks
Attatchments = takes up storage space, for small files
Inline embedding = shown in message body to add visual content
Hyperlinks = opened in web browser, for large file sizes like websites, videos, raw images
How to stop spam emails
Add respective email users on blacklist / whitelist
Remote logon / remote access
Allows authoerised users to connect to / control a device from a geographical distance through the internet or LAN
Uses remote desktop software as a solution e.g. AnyDesk
Advan/disadvan of messaging apps
- saves data transmission cost and time with automatic compression
- e-t-e encrypted
- installation of software needed
Advan/disadvan of email
- sends uncompressed files without losing quality
- cross-platform
- additional fee for more storage space
Advan/disadvan of cloud storage
- file size limit is large
- sends uncompressed files w/o losing quality
- auto-sync
- cross-platform
- additional fee for more storage space
Advan/disadvan of network drive over VPN
- no file size / format restriction
- low security risk with VPN
- VPN and specific network setup required
Advan/disadvan of P2P sharing
- download speed is faster
- malware may be packaged with torrent
