16. Connecting to a Network Flashcards
Purpose of modems?
Transmit frames across the WAN link
Purpose of routers?
Forwards packets between networks
Cellular digital communications standards
How does GSM differ from TIA?
Enabling SIM card use on unlocked devices with chosen providers
Cellular digital communications standards
How does TIA differ from GSM?
By tying the subscriber’s identity to the provider-managed device
In CDMA, device switching requires provider involvement
No SIM card in use.
802.11a bandwidth?
54 Mbps
What band does 802.11a use?
5GHz
802.11b bandwidth?
11 Mbps
What band does 802.11b use?
2.4GHz
802.11g bandwidth?
54 Mbps
What band does 802.11g use?
2.4GHz
802.11n bandwidth?
72.2 Mbps/stream (Single Channel)
150 Mbps/stream (Bonded Channels)
What band does 802.11n use?
2.4 &/or 5 GHz
802.11ac bandwidth?
1.7Gbps
What band does 802.11ac use?
5GHz
Purpose of compatibility mode in access points?
Broaden device support by accomodating old & new 802.11 standards
i.e. You might have a new router that supports 802.11ac but computers and tablets with wireless adapters that only support 802.11n. You can use the access point in compatibility mode to allow these devices to connect.
Downside to compatibility mode in access points?
Network can be slowed down
especially if 802.11b clients have to be supported. If possible, use newer standards only.
3 common encryption standards routers support?
- WEP
- WPA
- WPA2
Meaning of WEP?
Wired Equivalent Privacy
Meaning of WPA?
Wi-Fi Protected Access
Which encryption standard is stronger for routers?
WPA
or WPA2
WEP is flawed and you would only select this if compatibility with legacy devices and software is imperative.
What happens when a Windows Computer’s network configuration is set as Public?
Computer is undiscoverable & file sharing is disabled
Computer is hidden from other computers on the same network
What happens when a Windows Computer’s network configuration is set as Private?
Computer is discoverable & file sharing is enabled
Meaning of DRS?
Dynamic Rate Switching/Selection
Purpose of Wi-Fi’s DRS feature?
Dynamic Rate Switching/Selection
To allow devices to dynamically adjust data transmission rates based on signal quality
If the signal is strong, the station will select the highest available data rate, determined by the 802.11 standard. If the signal is weak, the station will reduce the data rate to try to preserve a more stable connection.
How are ports in a Switch/AP logically divided into groups?
via VLAN technology
Virtual LAN
How are communications between VLANs made?
via router
What does attenuation mean?
Loss of signal strength
