Cisco ENCOR IP Services and QoS 2

Question 1

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

Accepted Answer

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

Answer

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

Question 2

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

Accepted Answer

authPriv

Answer

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

Question 3

What is the function of IP SLA in Cisco IOS?

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

Policing

Answer

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

Question 5

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

Accepted Answer

NTP synchronization is blocked because no keys are trusted

Answer

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

Cisco ENCOR Practice Test