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IP Services and QoS Flashcards

6 cards from real Cisco ENCOR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 IP Services and QoS flashcards as text

  1. What is the purpose of the DHCP Option 82 (Relay Agent Information)?

    Answer: Insert client location information to help assign IP addresses based on port or VLAN

    DHCP Option 82 allows relay agents to insert circuit ID and remote ID information, enabling the DHCP server to make location-aware assignments.

  2. In SNMPv3, which security level provides both authentication and encryption?

    Answer: authPriv

    The authPriv security level uses HMAC for authentication and DES/AES for privacy (encryption) of SNMP messages.

  3. What is the function of IP SLA in Cisco IOS?

    Answer: Proactively measure network performance metrics like latency, jitter, and packet loss

    Cisco IP SLA generates synthetic test traffic to continuously measure network performance metrics such as delay, jitter, and availability.

  4. Which QoS mechanism discards excess traffic above a defined rate without buffering it?

    Answer: Policing

    Traffic policing drops or re-marks packets that exceed the configured rate, unlike shaping which buffers excess traffic.

  5. What is the default behavior of NTP authentication when configured with 'ntp authenticate' but no trusted keys?

    Answer: NTP synchronization is blocked because no keys are trusted

    Enabling NTP authentication without defining trusted keys prevents synchronization because no valid key exists to authenticate any source.

  6. Which mechanism does WRED use to proactively drop packets before a queue fills completely?

    Answer: Random early detection based on average queue depth and DSCP/IP Precedence

    WRED randomly drops packets based on average queue depth and traffic priority before the queue fills, reducing TCP synchronization.

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  1. cisco.com — Eligibility, renewal, score validity, test delivery, fees, time limit · verified Oct 2026