IP Services and QoS Flashcards

Which QoS model provides per-flow resource reservation using RSVP signaling?

Answer: IntServ

Integrated Services (IntServ) uses RSVP to reserve bandwidth and guarantee QoS on a per-flow basis end-to-end.

What DSCP value corresponds to Expedited Forwarding (EF), commonly used for voice traffic?

Answer: DSCP 46

Expedited Forwarding (EF) is defined as DSCP 46 (binary 101110) and is used for delay-sensitive traffic like VoIP.

Which NTP stratum level indicates the NTP server is directly connected to an authoritative time source?

Answer: Stratum 1

Stratum 1 NTP servers are directly synchronized to a Stratum 0 reference clock (e.g., GPS or atomic clock).

What is the purpose of SNMP traps?

Answer: Send asynchronous event notifications from agent to manager

SNMP traps are unsolicited notifications sent by an SNMP agent to the manager when a significant event occurs.

Which NAT type maps one internal IP address to one unique external IP address on a one-to-one basis?

Answer: Static NAT

Static NAT creates a permanent one-to-one mapping between an inside local and inside global IP address.

Which queuing mechanism guarantees minimum bandwidth and prioritizes delay-sensitive traffic using a strict priority queue?

Answer: LLQ

Low Latency Queuing (LLQ) adds a strict priority queue to CBWFQ, ensuring voice and real-time traffic is always serviced first.