Question 26

Carrier Ethernet provides MAN and WAN services using the 802.3 protocol. However, since the Ethernet standard is decentralized and non-determinant, collisions can occur throughout the network depending upon the network congestion levels.

True

False

10 points

Question 27

Select the correct statement(s) regarding Carrier Ethernet (CE).

		a. the Metro Ethernet Forum (MEF) defines a services framework for CE
		b. the E-line service is part of a typical CE offering
		c. MEF administers a certification process that ensures industry compliance with CE
		d. all statements are correct

10 points

Question 28

What is the difference between PBX and CENTREX?

		a. PBX is a custom switch provided by the PSTN, whereas CENTREX only provides certain standard features
		b. Organizational PBXs cannot be networked together, whereas CENTRX system can be networked together
		c. Both PBX and CENTREX switches are owned and operated by the organization using them vice the PSTN
		d. The PBX is a private organizational switch not owned or maintained by the PSTN, whereas CENTREX is a similar service owned and operated by the PSTN