Practice Test JNCIA

When you choose to read your e-mail using an e-mail client, your e-mail client interacts with which OSI layer?

• application

• session

• presentation

• transport

Which protocol is responsible for learning an IPv6 neighbor's MAC address?

• Neighbor Discovery Protocol (NDP)

• Media Access Control Security (MACsec)

• Address Resolution Protocol (ARP)

• Network Address Translation (NAT)

Which address correctly represents a valid abbreviation for the 2bfc:0000:0000:0000:0217:0000:fe8c:5c85/128 IPv6 address?

• 2bfc::217:0:fe8c:5c85/128

• 2bfc::0217::fe8c:5c85/128

• 2bfc:0:217::fe8c:5c85/128

• 2bfc:0:217:0:fe8c:5c85/128

What are two characteristics of UDP? (Choose two.)

• UDP is more reliable than TCP.

• UDP is connection-oriented.

• UDP operates at the transport layer.

• UDP packets are sent best-effort.

What are two functions of the transport layer? (Choose two.)

• packet forwarding

• segmentation

• flow control

• data integrity

Which two statements about exception traffic processing are correct? (Choose two.)

• When congestion occurs, exception traffic is not given preference.

• When congestion occurs, local and control traffic are given preference.

• By default, no rate-limiter for exception traffic exists on the internal link between the control plane and the forwarding plane.

• By default, a rate-limiter for exception traffic exists on the internal link between the control plane and the forwarding plane.

Which component is responsible for performing protocol updates and system management?

• bridging table

• forwarding tables

• Routing Engine

• Packet Forwarding Engine

How does the PFE determine how to forward transit traffic?

• The PFE uses the routing table provided by the RE.

• The PFE uses the forwarding table provided by the RE.

• The PFE determines network destinations itself, based on the RE's routing table.

• The PFE performs a destination lookup, based on its own routing table.

A packet enters a Junos device. No matching destination entry exists in the forwarding table. How will the device respond?

• The PFE responds to the destination with a source unreachable notification message.

• The RE responds to the source with a destination unreachable notification message.

• The PFE responds to the source with a destination unreachable notification message.

• The RE responds to the destination with a source unreachable notification message.

Which two statements describe the functions of the Packet Forwarding Engine (PFE)? (Choose two.)

• The PFE will process management traffic to help monitor and manage the network device.

• The PFE will route or switch packets or frames out of the correct interface as quickly as possible.

• The PFE will calculate the best network path to each individual subnet based on input from various routing protocols and static routes.

• The PFE will apply filters and policers when forwarding the packets to their final destination.