1. Which two statements about the WAN OSI Layer 1 are true? (Choose two.)
- It describes how data will be encapsulated into a frame.
- It describes the electrical, mechanical, and operational components needed to transmit bits.
- It includes protocols such as PPP, HDLC, and Ethernet.
- It includes protocols such as SDH, SONET, and DWDM.
Explanation: The WAN OSI Layer 1 describes the electrical, mechanical, and operational components needed to transmit bits, and includes protocols such as SDH, SONET, and DWDM.
2. Which WAN term defines the point where the subscriber connects to the service providers network.
- Customer Premises Equipment (CPE)
- Data Communications Equipment (DCE)
- Demarcation point
- Local Loop
- Point-of-Presence (POP)
Explanation: The POP defines the point where the subscriber connects to the service provider network.
3. Which two devices operate in a similar manner to the voiceband modem but use higher broadband frequencies and transmission speeds. (Choose two.)
- Cable Modem
- CSU/DSU
- DSL Modem
- Optical Converter
- Voiceband Modem
Explanation: Cable modems and DSL modems operate in a similar manner to the voiceband modem but use higher broadband frequencies and transmission speeds.
4. Which communication method is used in all WAN connections?
- Circuit-Switched
- Packet-Switched
- Parallel
- Serial
Explanation: The serial communication method is used in all WAN connections.
5. Which two WAN connectivity options are circuit-switched technologies? (Choose two.)
- ATM
- Ethernet WAN
- Frame Relay
- ISDN
- PSTN
Explanation: PSTN and ISDN are two WAN circuit-switched connectivity options.
6. Which two WAN connectivity options are packet-switched technologies? (Choose two.)
- Ethernet WAN
- Frame Relay
- ISDN
- PSTN
Explanation: Ethernet WANs and Frame Relay are two WAN packet-switched connectivity options.
7. Which service provider fiber-optic technology increases the data-carrying capacity using different wavelengths?
- DWDM
- SDH
- SONET
Explanation: DWDM is a service provider fiber-optic technology that increases the data-carrying capacity using different wavelengths.