JNCIA-Junos JN0-105 Practice V.1

Which two statements accurately describe a broadcast domain? (Choose two.)

• Broadcast domains consist of devices that reside on the same subnetwork.

• Broadcast domains require a gateway device such as a router.

• Broadcast domains consist of all devices connected to a common switch or hub.

• Broadcast domains consist of a group of devices that can be reached by sending a frame addressed to the Layer 2 broadcast address.

How many usable host IP addresses are available for use in the 172.27.1.0/24 network?

• 24

• 256

• 126

• 254

What is the network address for a host with an IP address of 192.168.87.125/16?

• 192.168.96.0

• 192.168.87.0

• 192.168.128.0

• 192.168.0.0

Which layer of the OSI model does a router use to make forwarding decisions?

• Layer 3

• Layer 4

• Layer 5

• Layer 2

What are three benefits of using IPv6? (Choose three.)

• IPv6 reduces administrative overhead using stateless address autoconfiguration for hosts.

• IPv6 supports a greater level of security by integrating features that were optional add-ons in IPv4.

• IPv6 provides backward compatibility with IPv4 using the Next Header field.

• IPv6 represents large IP addresses using dotted decimal notation.

• IPv6 eliminates the need for private to public NAT using a large address pool.

Which two statements describe PFE functions? (Choose two.)

• PFE provides access to the CLI and J-Web.

• PFE implements rate limiting using policers.

• PFE stores a local copy of the Layer 2 and Layer 3 forwarding tables.

• PFE stores the master copy of the Layer 2 and Layer 3 forwarding tables.

Which statement is true about the internal link between the Routing Engine and the Packet Forwarding Engine?

• It is rate limited to avoid DDoS attacks.

• It is only used to send the forwarding table from the Routing Engine to the Packet Forwarding Engine.

• It is only used for exception traffic.

• It is an Fast Ethernet link called fxp2.

With regard to the Junos software architecture, which two of the following are found on all Junos devices? (Choose two.)

• multiple software daemons

• application-specific integrated circuits (ASICS)

• separate management interface (fxp0)

• separation of control and forwarding

What is a function of the PFE?

• to generate forwarding tables

• to apply stateless firewall filters

• to monitor chassis components

• to generate protocol control traffic

What are two benefits of a modular operating system? (Choose two.)

• Each module runs in its own protected memory space.

• A malfunction in one module causes a full system shutdown.

• It enables CPU scheduling strictly using kernel system calls.

• It enables the independent restart of each module as necessary.