ENSA - Modules 9-12

1. What is the term used to indicate a variation of delay?

• • latency

• • serialization delay

• • speed mismatch

• jitter

2. A network engineer performs a ping test and receives a value that shows the time it takes for a packet to travel from a source to a destination device and return. Which term describes the value?

• • jitter

• latency

• • priority

• • bandwidth

3. What role do network devices play in the IntServ QoS model?

• Network devices ensure that resources are available before traffic is allowed to be sent by a host through the network.

• • Network devices provide a best-effort approach to forwarding traffic.

• • Network devices are configured to service multiple classes of traffic and handle traffic as it may arrive.

• • Network devices use QoS on a hop-by-hop basis to provide excellent scalability.

4. Which device would be classified as a trusted endpoint?

• • switch

• • router

• firewall

• • IP phone

5. What is the benefit of deploying Layer 3 QoS marking across an enterprise network?

• Layer 3 marking can carry the QoS information end-to-end.

• • Layer 3 marking can carry QoS information on switches that are not IP aware.

• • Layer 3 marking can be carried in the 802.1Q fields.

• • Layer 3 marking can be used to carry non-IP traffic.

6. What is the function of a QoS trust boundary?

• • A trust boundary identifies the location where traffic cannot be remarked.

• • A trust boundary only allows traffic to enter if it has previously been marked.

• A trust boundary identifies which devices trust the marking on packets that enter a network.

• • A trust boundary only allows traffic from trusted endpoints to enter the network.

7. What are two approaches to prevent packet loss due to congestion on an interface? (Choose two.)

• • Decrease buffer space.

• • Disable queuing mechanisms.

• Drop lower-priority packets.

• Prevent bursts of traffic.

• Increase link capacity.

8. What configuration scenario would offer the most protection to SNMP get and set messages?

• • SNMPv2 for in-band management with read-write community strings

• • SNMPv1 with out-of-band management in a private subnet

• SNMPv3 configured with the auth security level

• • SNMP community strings

9. Refer to the exhibit. The network administrator enters these commands into the R1 router:

R1# copy running-config tftp
Address or name of remote host [ ]?

When the router prompts for an address or remote host name, what IP address should the administrator enter at the prompt?

• • 192.168.9.254

• • 192.168.10.2

• 192.168.11.252

• • 192.168.11.254

• • 192.168.10.1

10. The command ntp server 10.1.1.1 is issued on a router. What impact does this command have?

• • determines which server to send system log files to

• synchronizes the system clock with the time source with IP address 10.1.1.1

• • identifies the server on which to store backup configurations

• • ensures that all logging will have a time stamp associated with it