1. Internetworking Basics Flashcards
Define what an internetwork is.
Two or more networks joined together via a router configured with a logical network addressing scheme (e.g. IPV4, IPV6
A simple network composed of a few devices and a hub contains …
One collision domain and one broadcast domain
What is network segmentation?
The process of breaking up a larger network into smaller ones in order to reduce traffic congestion
What does a switch break up?
Collision domains
Name 6 things that commonly cause LAN traffic congestion
- Too many hosts in a collision or broadcast domain
- Broadcast storms
- Too much multicast traffic
- Low bandwidth
- Adding hubs for connectivity to the network
- A bunch of ARP broadcasts
What is the default purpose of a router?
It breaks-up a broadcast domain into smaller broadcast domains
How many network segments are contained in a network of two computers connected by a hub?
One
How would you connect a LAN to a Wide Area Network?
Using a router that has a serial interface to the WAN.
Name a typical physical interface type on a Cisco router.
v35
Name two advantages of using routers in your network
- They don’t forward broadcasts by default
2. They can filter network traffic based on layer 3 (Network layer) information such as an IP address.
Name 4 networking related functions of a router
- Packet switching
- Packet filtering
- Internetwork communication
- Path selection
A routing table is essentially what?
A map of the internetwork
Switches create separate …
collision domains within a single broadcast domain.
Routers provide …
a separate broadcast domain for each interface.
What does a bridge do?
It allows you to connect a few devices (2-16) together. Each device has a separate collision domain between itself and the bridge. Hence, no collisions, but still one broadcast domain.
You would use a bridge in a network to …
reduce the number of collisions by dividing a single collision domain into multiple collision domains whilst keeping all connected devices within the same broadcast domain.
What do you increase when you use a bridge to connect devices to a network?
More bandwidth for users because you eliminate collisions between devices connected to the bridge.
What do you create when you use hubs in an Ethernet network?
Network traffic congestion because you create a larger collision domain which increases the number of collisions.
What would virtual LANs split up?
A broadcast domain
What is a WLAN device?
A device that connects to a wireless network using a Network Interface Card (NIC)
What do you use an Access Point (AP) for?
To connect wireless devices to a wired network
What is a firewall?
A network security system that monitors and controls incoming and outgoing traffic based on security rules
What does IPS mean?
Intrusion Prevention System
What is a Cisco ASA firewall
Adaptive Security Appliance. Typically establishes a barrier between a trusted internal network and the Internet.
