Telecommunications Telecommunications Protocols 3

Question 1

What is the function of PPP in WAN communications?

Accepted Answer

Provide a standard data link protocol for point-to-point serial connections

Answer

PPP (Point-to-Point Protocol) is a data link layer protocol used to establish direct connections between two nodes over serial WAN circuits.

Question 2

What does the DSCP EF (Expedited Forwarding) designation ensure for voice traffic?

Accepted Answer

Low latency, low jitter, and low packet loss treatment

Answer

DSCP EF (DSCP value 46) marks packets for Expedited Forwarding, ensuring they receive low-latency, low-jitter, low-loss treatment through the network.

Question 3

What is the purpose of IEEE 802.1Q in Ethernet networks?

Accepted Answer

Enable VLAN tagging in Ethernet frames

Answer

IEEE 802.1Q defines the VLAN tagging standard, adding a 4-byte tag to Ethernet frames to carry VLAN membership information.

Question 4

What does an SLA (Service Level Agreement) typically specify for telecom services?

Accepted Answer

Guaranteed uptime, latency, jitter, and packet loss thresholds

Answer

A telecom SLA defines measurable performance commitments including availability (uptime), latency, jitter, and packet loss that the carrier guarantees.

Question 5

What protocol does IPsec use for key exchange?

Accepted Answer

IKE (Internet Key Exchange)

Answer

IKE (Internet Key Exchange) is the protocol used by IPsec to negotiate security associations and exchange cryptographic keys.

Telecommunications Practice Test

Telecommunications Practice Test

Telecommunications Telecommunications Protocols 3