Network Components Flashcards
What is an endpoint or client?
Client is individual using the network
Endpoint dev like pc, laptop, mobile, server (anything using the network)
What is a server?
Something that and enpoint/client is speaking with.
(like watching youtube being streamed from a server)
Devices that hold content
Email, Web, DNS, Video
What is a switch?
Dev that let us connect within LAN (usually)
Has high port density for connections
All the dev connect into the switches to enable local communication
Inside network
What is a router?
Allow LANs to speak to WANs
Connection out of office to WAN
What is an access point?
Dev that plugs into switch and gives wireless connectivity
Connects the WLAN to the LAN (usually connected to wireless router)
Each WLAN is an SSID (when you look at network connections and see all the available networks - each is a SSID (Service Set Identifier))
Then the AP assigns you an IP - and you can connect to internet
AP broadcasts the SSID through beacons (using RF) and your wireless dev gets the RFs
Is basically hub - just broadcast the SSID - and is L2 bridge that takes the wireless signal and switches to the ethernet network
What is a L3 switch?
Switch that can operate at L2 and L3
Can connect through wireless to AP to switch or direct to switch
L3 switch has router capabilities built into them
Has access to the WAN
What is the cloud?
Represents something you as network engineer don’t care about
You don’t manage it you just store data on there
Hosting environments in cloud:
AWS
Azure
What is a firewall?
Equipment to secure network
Firewalls usually btw edge router and internet
Firewall can have router capability (then go to switch maybe)
Firewalls look at traffic going in and out and makes filtering decisions (like blocking internet connections)
What is an IPS?
Intrusion Prevention System
Way to stop more complex attacks against network
Usually used when hosting something
Can interrogate or review the inforamation a host is sending (firewall can’t do this)
Sits behind the firewall to determine if host is sending malicious data
What is a NGFW?
Next Generation Firewall
Has often IPS included in the firewall
Also like DLP (Data leak prevention) - like pc sending info it shouldnt and FW will stop it
Can filter to the detail of if a particular PC can access a particular website
Can filter based on application and not just protocol info
Can check the data
Might be slower than FW and IPS
Also expensive
What are Controllers?
WLC - Wireless LAN Controller
Cisco DNA Center
What is a WLC?
Wireless LAN Controller
Have switch with lots of access points - use WLC to manage all the AP at once
WLC hosts server and it controlls all communication to/from AP with needing to log into to each one
Controller speaks to each AP and say hey - use this password and user name
Have single point to see what AP are up and down
Central way to manage/control all AP
What is a Cisco DNA?
Cisco
Part of software defined network section
