133 lines
3.1 KiB
Markdown
133 lines
3.1 KiB
Markdown
---
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id: 1771668476-SUCR
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aliases:
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- 01. Network Devices - CCNA
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tags:
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- CCNA
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---
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# Network Devices
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## What is a network
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A computer network is a digital telecommunications network which allows nodes to share resources.
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### [[Router]]
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Is represented with a circle where inside there are 2 horizontal arrow poiting
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inside and 2 vertical arrow pointing outside
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Have fewer network interfaces than switches
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Are used to provide connectivity **between** LANs
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Are therefore used to send data over the Internet
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example of [[Cisco]] routers:
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- [[ISR 1000]]
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- [[ISR 900]]
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- [[ISR 4000]]
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### [[Switch]]
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Is represented with square 4 horizontal 2 poiting to the left and 2 pointing to the right
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Switches a used to connect a [[LAN]]
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Have many network interfaces/oirts for end hosts to connect to (usually 24)
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Provide connectivity to hosts within the same LAN
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do not provide connectivity between LANs/ over the internet
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example of [[Cisco]] switches:
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- [[Catalyst 9200]]
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- [[Catalyst 3650]]
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### [[Firewall]]
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Is represented with square with a brickwall inside of it
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Monintor and control network traffic based on configured rules.
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Can be placed 'Inside' the network, or 'outside' the network
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Are known as 'Next-Generation Firewall' when they include more modern and advanced filtering capabilities
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example of [[Cisco]] firewalls:
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- [[ASA 5500-X]]
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- [[Firepower 2100]]
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#### Host-based firewalls
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Are software applications that filter traffic entering and exiting a host machine, like a [[PC]]
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### [[Server]]
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Is represented with square with a computer inside of it
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**A device that provides functions or services for clients.**
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The same device can be a client in some situations, and a server in other situations.
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### [[Client]]
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Is represented with square with a monitor inside of it
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Can be a computer, a laptop, or a phone
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**A client is a device that accesses a service made available by a server.**
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### [[Internet]]
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Is represented with circle with a cloud inside of it
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## Building a network
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2 pc connected together create a network
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## Quiz
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1. Your company wants to purchase some network hardware to which they can plug the 30 PCs in your department.
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which type of network device is appropriate?
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a) A router
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b) A firewall
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c) A switch
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d) A server
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**good answer: c**
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2. You received a video file from your friend's [[Apple]] [[iPhone]] using [[AirDrop]].
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What was his iPhone functioning as in that transaction?
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a) A server
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b) A client
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c) A LAN
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**good answer: a**
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3. what is your computer or smartphone functioning as while you watch this video?
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a) A server
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b) An end host
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c) A client
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**good answer: c**
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4. Your company wants to purchase some network hardware to connect its separate network together.
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what kind of network device is appropriate ?
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a) A firewall
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b) A host
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c) a LAN
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d) A router
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**good answer: d**
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5. Your company wants to upgrade its old network firewall that has been in use for several years to one that provides more advanced function.
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What kind of firewall should they purchase ?
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a) A host-based firewall
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b) A next-level firewall
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c) A next-generation firewall
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d) A top-layer firewall
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**good answer: c**
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