Shared Flashcard Set

Details

Network + Section 3
Modules 3.1 - 3.4
69
Computer Networking
Professional
04/20/2011

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Cards

Term
What does modem stand for?
Definition
modulator/demodulator
Term
What does a modem do?
Definition
Converts analog to digital and digital to analog
Term
What are modems commonly used for now?
Definition
Utility functions
Term
What are the limitations of a modem?
Definition
Limited frequencies and limited bandwidth
Term
What does NIC stand for?
Definition
Network Interface Card
Term
What does a repeater do?
Definition
Repeats and regenerates a signal
Term
What OSI layer does a repeater operate on?
Definition
OSI Layer 1 (Physical)
Term
What is a hub?
Definition
A Multi-port repeater
Term
What is the speed range for a hub?
Definition
10 Mbit/s - 100Mbit/s
Term
Which OSI layer do hubs operate on?
Definition
OSI Layer 1 (Physical)
Term
What does a bridge do?
Definition
Connects different physical networks
Term
A Bridge distributes traffic based on ________________.
Definition
MAC adresses
Term
What OSI layer do bridges operate on?
Definition
OSI Layer 2 (Data Link)
Term
In a switch, bridging is done in _____________.
Definition
Hardware
Term
What does ASIC stand for?
Definition
Application Specific Integrated Circuit
Term
What OSI layer do switches operate on?
Definition
OSI Layer 2 (Data Link)
Term
What is today's standard in networking infrastructure?
Definition
Switch
Term
What is a WAP?
Definition
A wireless acces point, essentially a bridge with wireless capability
Term
What OSI layer does a WAP operate on?
Definition
OSI Layer 2 (Data Link)
Term
What does a router do?
Definition
Routes traffic between IP subnets
Term
What OSI Layer does a router operate on?
Definition
OSI Layer 3 (Network)
Term
What is a common secondary name for a router?
Definition
Layer 3 switch
Term
What do we call a device that filters traffic by port number?
Definition
Firewall
Term
What OSI Layer do Firewalls operate on?
Definition
OSI Layer 4 (Transport)
Term
Where are firewalls normally located?
Definition
At the egress/ingress point
Term
What kind of device can encrypt traffic coming in and out of the network, and proxy traffic?
Definition
Firewall
Term
What does a DHCP server do?
Definition
Automatically assigns IP addresses
Term
What is the difference between an IDS and an IPS?
Definition
an IDS provides an alarm or alert of an intrusion, whereas an IPS stops an intrusion
Term
What is an intrusion?
Definition
An exploit against a system
Term
What does IDS stand for?
Definition
Intrusion Detection System
Term
What does IPS stand for?
Definition
Intrusion Prevention System
Term
What type of device will distribute a load over a cluster of servers?
Definition
Load Balancer
Term
What is a method of load balancing that distributes a load based on content?
Definition
Content Switch
Term
What do we call a device that is a switch, router, firewall, load balancer, content switch, IDP/IPS, etc. combined into one device?
Definition
Multilayer Switch
Term
What does a DNS server do?
Definition
Converts domain names to IP addresses and vice versa
Term
What is the name of a device that can set priorities on bandwidth for applications and can manage QoS?
Definition
Bandwidth Shaper
Term
What does QoS stand for?
Definition
Quality of Service
Term
What is a device that sits between the user and the internet and is able to cache information?
Definition
Proxy Server
Term
What is used to connect routers to a WAN link?
Definition
CSU/DSU
Term
What does CSU/DSU stand for?
Definition
Channel Service Unit/Data Service Unit
Term
What does PoE stand for?
Definition
Power over Ethernet
Term
What is the voltage provided by PoE?
Definition
36-57 volts
Term
What is the amperage provided by PoE?
Definition
10 - 400mA
Term
What is the maximum load of PoE?
Definition
15.4 Watts
Term
Which PoE mode uses the pairs of wires not used for data?
Definition
Mode B
Term
What pairs does PoE mode A use?
Definition
1/2 and 3/6
Term
What pairs does mode B use?
Definition
4/5 and 7/8
Term
What is STP designed to prevent?
Definition
loops in switched/bridged networks
Term
What does STP stand for?
Definition
Spanning Tree Protocol
Term
What OSI layer does STP operate on?
Definition
OSI Layer 2 (Data Link)
Term
What is 802.1w?
Definition
Spanning Tree Protocol
Term
What does RSTP stand for?
Definition
Rapid Spanning Tree Protocol
Term
What is the STP convergence time?
Definition
30-50 seconds
Term
What is the RSTP convergence time?
Definition
1 second
Term
In STP, what do we call the bridge with the lowest number?
Definition
The root bridge
Term
In STP, what are the three types of ports?
Definition
Root Port, Designated Port, and Blocked Port
Term
What can VLAN manage?
Definition
Access, Security, and Changes
Term
What do we call the practice of having multiple VLANs on a single wire?
Definition
Trunking
Term
What is the Trunking protocol?
Definition
802.1q
Term
What practice duplicates traffic on a physical port and sends a copy to an analyzer (SPAN)?
Definition
Port Mirroring
Term
What does SPAN stand for?
Definition
Switched Port Analyzer
Term
What is the standard for physical port authentication?
Definition
802.1x
Term
What methods do 802.1x authentications use?
Definition
RADIUS or TACACS+
Term
What does RADIUS stand for?
Definition
Remote Access Dial In User Service
Term
What does TACSACS+ stand for?
Definition
Terminal Access Controller Access Control System Plus
Term
What is the Windows default built in wireless configuration?
Definition
Windows Wireless 0
Term
What three Wireless channels do we use in the US to prevent interference?
Definition
1,6,11
Term
What does ESSID stand for?
Definition
Extended Service Set Identification
Term
What are the three major metrics for verifying wireless installations?
Definition
Signal coverage, Potential Interference, Spectrum Analyzer
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