- Router 💻
• An OSI layer 3 device
• Routes traffic between IP subnets
• Routers inside of switches are sometimes
called “layer 3 switches”
• Layer 2 = Switch, Layer 3 = Router
• Often connects diverse network types -
LAN, WAN, copper, fiber
• An OSI layer 3 device
• Routes traffic between IP subnets
• Routers inside of switches are sometimes
called “layer 3 switches”
• Layer 2 = Switch, Layer 3 = Router
• Often connects diverse network types -
LAN, WAN, copper, fiber
- Switch 💻
• An OSI layer 2 device
• Hardware bridging ASICs (very fast!)
• Forwards traffic based on MAC address
• The core of an enterprise network
• High bandwidth - Many simultaneous packets
• An OSI layer 2 device
• Hardware bridging ASICs (very fast!)
• Forwards traffic based on MAC address
• The core of an enterprise network
• High bandwidth - Many simultaneous packets
- Hub 💡
• An OSI layer 1 device
• Multi-port repeater
• Everything is half-duplex
• Becomes less efficient as speeds increase
• An OSI layer 1 device
• Multi-port repeater
• Everything is half-duplex
• Becomes less efficient as speeds increase
The different between Hub & Switch ..
- Switch
- جهاز ذكي
- جهاز غالي
- عدد المنافذ فيه من 24 الى 28
- جهاز متطور ويستخدم للآن
- اختراق الانظمه سهل
- Hub
- جهاز مو ذكي
- جهاز رخيص
- عدد المنافذ كحد اقصى 4 منافذ
- جهاز قديم وقليل استخدامه
- اختراق الانظمه صعب
- Switch
- جهاز ذكي
- جهاز غالي
- عدد المنافذ فيه من 24 الى 28
- جهاز متطور ويستخدم للآن
- اختراق الانظمه سهل
- Hub
- جهاز مو ذكي
- جهاز رخيص
- عدد المنافذ كحد اقصى 4 منافذ
- جهاز قديم وقليل استخدامه
- اختراق الانظمه صعب
- Firewall
• OSI layer 4 (TCP/UDP), some firewalls filter through OSI layer 7
• Filters traffic by port number
• Can encrypt traffic into/out of the network
and between sites
• Can proxy traffic - A common security technique
• Most firewalls can be layer 3 devices (routers)
• OSI layer 4 (TCP/UDP), some firewalls filter through OSI layer 7
• Filters traffic by port number
• Can encrypt traffic into/out of the network
and between sites
• Can proxy traffic - A common security technique
• Most firewalls can be layer 3 devices (routers)
Wireless Access Point ⚙️
• OSI layer 2 device
• Not a wireless router
• A WAP is a bridge - makes forwarding
decisions based on MAC address
• OSI layer 2 device
• Not a wireless router
• A WAP is a bridge - makes forwarding
decisions based on MAC address
- Modem 💻
• Modulator / Demodulator
• Uses standard phone lines
• POTS modems now used for
• backup and utility functions
• Modulator / Demodulator
• Uses standard phone lines
• POTS modems now used for
• backup and utility functions
Intrusion detection/prevention system \ IDs & IPs ..
• Protects against OS and application exploits
• Detection - alerts but does not stop the attack • Prevention - blocks the attack
• Network-based - high-speed appliances
• Host-based - runs on your operating system
• Protects against OS and application exploits
• Detection - alerts but does not stop the attack • Prevention - blocks the attack
• Network-based - high-speed appliances
• Host-based - runs on your operating system
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