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JNCIA-Junos Practice Test One Exam Answers

Question 1: With regard to the Junos software architecture, which two of the following are found on all Junos devices? (Choose two.)

  • multiple software daemons
  • separation of control and forwarding

Question 2: What are two Junos processes? (Choose two.)

  • routing protocols process
  • Packet Forwarding Engine process

Question 3: The Junos software kernel is based on which operating system?

  • FreeBSD

Question 4: Which two statements are correct regarding the internal link between the control plane and forwarding plane? (Choose two.)

  • The internal link rate limits exception traffic to protect the Routing Engine against denial-of-service attacks.
  • The internal link has a built-in rate limiter that is not configurable.

Question 5: What are three examples of exception traffic? (Choose three.)

  • SNMP traffic destined to the Junos device
  • Packets with special IP options fields
  • OSPF protocol updates

Question 6: Which part of the Junos architecture handles ICMP time-to-live (TTL) expired messages?

  • forwarding plane

Question 7: What are two functions of the Packet Forwarding Engine? (Choose two.)

  • to implement policing, firewall filtering, and class of service (CoS)
  • to forward packets based on the forwarding table

Question 8: When a non-root user connects to a Junos device and successfully enters a username and password, they are immediately placed at which level?

  • operational mode

Question 9: In which Junos mode are users allowed to monitor and troubleshoot software, network connectivity, and hardware?

  • operational

Question 10: In which mode can you configure a device running Junos?

  • configuration

Question 11: Which Junos mode should you use to view the status of interfaces on a router?

  • operational

Question 12: Which statement about the Junos CLI is true?

  • Automatic word completion can be disabled in operational mode.

Question 13: What information does the help reference command provide? (Choose three.)

  • command default parameters and allowed value ranges
  • command syntax
  • the configuration level at which the command can be entered

Question 14: The auto-complete feature in the Junos CLI is triggered by which methods?

  • pressing the Tab key for both variable and command completion and the Spacebar for command completion

Question 15: What information does the help topic command provide?

  • software documentation describing features and configuration tasks within the Junos OS

Question 16: Which character in the Junos software CLI allows you to filter and manipulate command output?

  • pipe character

Question 17: When you first log in to a router, how does the router indicate that factory defaults are being used?

  • The router’s host name is Amnesiac.

Question 18: Which configuration command can you use to reset a Junos device to factory defaults?

  • load factory-default

Question 19: After factory-defaults have been loaded, which two syslog files will be present in the configuration?

  • messages and interactive-commands

Question 20: Which three configuration elements are considered part of the initial configuration? (Choose three.)

  • hostname
  • management access interface
  • root password

Question 21: What are two valid initial configuration methods supported on Junos devices? (Choose two)

  • CLI
  • J-Web

Question 22: Which command would correctly define a Junos device’s hostname?

  • user@host# set system host-name <name>

Question 23: Which Junos CLI operational command will gracefully shut down a router?

  • request system halt

Question 24: user@host> set date 199708290900.00

  • Which command correctly sets a Junos device’s date and time?

Question 25: Which two statements are true about the rescue configuration file? (Choose two.)

  • You can load it by entering rollback rescue.
  • You need to create it using the command request system configuration rescue save.

Question 26: Which two statements are true about login classes in the Junos OS? (Choose two.)

  • Each login class is associated with one or more permissions flags.
  • Individual commands can be explicitly allowed or denied.

Question 27: Which operational command allows you to quickly verify the state of all physical and logical interfaces?

  • show interfaces terse

Question 28: The monitor traffic command closely resembles which UNIX-based utility?

  • tcpdump

Question 29: Which two statements are correct about the disable command and the deactivate commands? (Choose two.)

  • If the interface is deactivated, the interface configuration is ignored during commit.
  • If the interface is disabled, the logical unit will administratively shut down.

Question 30: In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?

  • collisions on the half-duplex side; framing errors on the full-duplex side

Question 31: When a local loopback is activated on a PPP serial link, which of the following indicates that the local interface is good?

  • The interface shows a flag indicating that a loop is detected.

Question 32: Which operational command would you enter to see a concise display of which interfaces are up and which are down?

  • show interfaces terse

Question 33: Which operational command is a valid way to view the status of an interface?

  • show interfaces fe-0/0/0 extensive

Question 34: Which operational command is used to view status messages sent to a file named test as they are sent?

  • monitor start test

Question 35: In which routing table would you find an OSPFv2 route?

  • inet.0

Question 36: Which routing table is used for all IPv4 unicast forwarding?

  • inet.0

Question 37: By default, which routing table is used to store unicast IPv4 routes?

  • inet.0

Question 38: Which two statements are correct about routing tables in a Junos device? (Choose two.)

  • There are separate tables for IPv4 and IPv6 called inet.0 and inet6.0, respectively.
  • All running protocols can populate the routing tables at the same time.

Question 39: Which type of routes are held in inet.0?

  • IPv4 unicast routes

Question 40: What is the role of route preference?

  • It is used to determine which route should become active.

Question 41: What is a characteristic of route preference?

  • A lower preference is better than a higher preference.

Question 42: Which operational command displays the routing table?

  • show route

Question 43: Which operational command allows viewing of only OSPF routes?

  • show route protocol ospf

Question 44: Which statement is true about a forwarding table?

  • It stores a subset of information from the routing table.

Question 45: Which statement is correct about a routing policy term?

  • A term acts like “if” and “then” statements.

Question 46: Your Junos device has a routing policy with three terms. The first term of the policy does not contain a terminating action. What happens to the routes after they have been evaluated by the first term?

  • The routes are evaluated by the second term in the policy.

Question 47: Which statement is true about import and export routing policies?

  • Import policies concern routes received and determine which routes get put into the routing table.

Question 48: Your routing table contains four static routes, which you need to redistribute to your OSPF peers. Which method would accomplish this task?

  • Apply an export policy to OSPF, which will export the static routes to your OSPF neighbors.

Question 49: Which three of the following are considered match criteria in a policy? (Choose three.)

  • prefix-list
  • AS path
  • protocol ospf

Question 50: Which two of the following are considered match criteria in a policy? (Choose two.)

  • community
  • AS path

Question 51: Which of the following is a valid match criteria for a firewall filter?

  • from protocol tcp

Question 52: Which two policy actions are considered flow control actions? (Choose two.)

  • next policy
  • next term

Question 53: What is a valid action for a firewall filter?

  • then count

Question 54: What are three terminating actions for a firewall filter? (Choose three.)

  • reject
  • discard
  • accept

Question 55: What are two functions of the Routing Engine? (Choose two.)

  • to build the Layer 2 and Layer 3 forwarding tables
  • to build OSPF and IS-IS adjacencies

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