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Questions-CertNCIA-#1

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Certncia 1
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Quiz by fdsqwertyfds qwerty, updated more than 1 year ago
fdsqwertyfds qwerty
Created by fdsqwertyfds qwerty about 8 years ago
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Resource summary

Question 1

Question
Which word starts a command to display the operational status of a Junos device?
Answer
  • A. put
  • B. set
  • C. show
  • D. get

Question 2

Question
Which command prompt indicates that you are in operational mode?
Answer
  • A. user@router&
  • B. user@router#
  • C. user@router%
  • D. user@router>

Question 3

Question
What is the decimal equivalent of 00000100?
Answer
  • A. 2
  • B. 4
  • C. 9
  • D. 12

Question 4

Question
What is a valid IPv6 address?
Answer
  • A. 00:05:85:23:45:67
  • B. 127.0.0.1
  • C. 2001:0db8:3000:2215:0000:0000:aaaa:1111
  • D. 49.0001.0192.0168.1001.00

Question 5

Question
Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?
Answer
  • A. 2001::1::cbff:2:0001/64
  • B. 2001::1000::cbff:20:1/64
  • C. 2001:0:1000::cbff:20:1/64
  • D. 2001:0:1:0:0:cbff:2:1/64

Question 6

Question
What are three characteristics of UDP? (Choose three.)
Answer
  • A. UDP is faster than TCP.
  • B. UDP operates at the Transport Layer.
  • C. UDP is connection-oriented.
  • D. UDP data is sent best-effort.
  • E. UDP is more reliable than TCP.

Question 7

Question
Which layer in the OSI model is responsible for translating frames into bits?
Answer
  • A. Application Layer
  • B. Presentation Layer
  • C. Data Link Layer
  • D. Physical Layer

Question 8

Question
Which layer in the TCP/IP model is responsible for delivering packets to their destination?
Answer
  • A. Application Layer
  • B. Transport Layer
  • C. Internet Layer
  • D. Network Access Layer

Question 9

Question
Why is IPv6 packet processing more effective than IPv4 packet processing?
Answer
  • A. fixed header size
  • B. smaller header size
  • C. fewer header fields
  • D. variable header size

Question 10

Question
A user opens a webpage that requires the transmission of packets from the Web server to the client's browser. The packets transmitted from the Web server to the client exceed the smallest MTU value on the communications path. Which two protocol functions allow this type of communication? (Choose two.)
Answer
  • A. packet segmentation
  • B. serialized checking
  • C. packet sequencing
  • D. parallel checking

Question 11

Question
Which two statements are true about TCP communication? (Choose two.)
Answer
  • A. The receiver acknowledges the final packet in each communications stream.
  • B. The receiver adds sequencing numbers to the packets received.
  • C. The sender adds sequencing numbers to the packets it sends.
  • D. The receiver acknowledges each packet it receives from the sending device.

Question 12

Question
Which two statements are true about optical networks? (Choose two.)
Answer
  • A. SONET and SDH both use time-division multiplexing.
  • B. An optical transport network system uses time-division multiplexing.
  • C. SONET and SDH both use wavelength-division multiplexing.
  • D. An optical transport network system uses wavelength-division multiplexing.

Question 13

Question
At which layer of the OSI model does error checking occur with IPv6?
Answer
  • A. Layer 2
  • B. Layer 3
  • C. Layer 4
  • D. Layer 7

Question 14

Question
Which statement is correct regarding IPv6 addresses?
Answer
  • A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.
  • B. An IPv6 address consists of 64 bits separated into four 16-bit hexadecimal sections.
  • C. An IPv6 address consists of 128 bits separated into sixteen 8-bit hexadecimal sections.
  • D. An IPv6 address consists of 64 bits separated into eight 8-bit hexadecimal sections.

Question 15

Question
Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)
Answer
  • A. LSPs are bidirectional.
  • B. LSPs are unidirectional.
  • C. LSPs must follow the IGP's shortest path.
  • D. LSPs can follow paths other than the IGP's shortest path.

Question 16

Question
What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.)
Answer
  • A. End hosts determine the path MTU for IPv6.
  • B. End hosts determine the path MTU for IPv4.
  • C. Packet fragmentation occurs at intermediate nodes for IPv4.
  • D. Packet fragmentation occurs at intermediate nodes for IPv6.

Question 17

Question
-- Exhibit -- user@router> show route protocol static inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 99.0.0.0/17 *[Static/5] 00:00:11 >to 10.1.1.2 via ge-0/0/1.0 99.0.0.0/19 *[Static/5] 00:00:11 >to 10.1.2.2 via ge-0/0/2.0 99.0.0.0/24 *[Static/5] 00:00:11 >to 10.1.3.2 via ge-0/0/3.0 99.0.0.0/26 *[Static/5] 00:00:11 >to 10.1.4.2 via ge-0/0/4.0 -- Exhibit -- In the exhibit, there are four static routes that route traffic through different interfaces. Which interface does the router use if traffic is sent to the 99.0.0.1 destination?
Answer
  • A. ge-0/0/1
  • B. ge-0/0/2
  • C. ge-0/0/3
  • D. ge-0/0/4

Question 18

Question
In dotted decimal notation, what is the equivalent of 11010101 01000010 01111111 11000010?
Answer
  • A. 213.66.127.194
  • B. 214.66.128.195
  • C. 212.64.143.194
  • D. 213.66.111.194

Question 19

Question
What is the binary equivalent of 242.168.94.124?
Answer
  • A. 11110011 10101000 01011110 01111100
  • B. 11110010 10101010 01011110 01111100
  • C. 11110010 10101000 01011110 01111100
  • D. 11110010 10101000 01010110 01111100

Question 20

Question
What is the last usable IP address in the 218.6.0.0/17 network?
Answer
  • A. 218.6.125.254
  • B. 218.6.126.254
  • C. 218.6.127.254
  • D. 218.6.128.254

Question 21

Question
What is the network address for the 10.13.147.100/19 host?
Answer
  • A. 10.13.128.0
  • B. 10.13.147.0
  • C. 10.13.0.0
  • D. 10.13.100.0

Question 22

Question
Which two prefixes would summarize the networks shown below? (Choose two.) 192.168.1.0/24 192.168.2.0/24 192.168.3.0/24
Answer
  • A. 192.168.0.0/23
  • B. 192.168.0.0/22
  • C. 192.168.0.0/24
  • D. 192.168.0.0/21

Question 23

Question
How many host addresses are available in the /28 network?
Answer
  • A. 6
  • B. 14
  • C. 28
  • D. 30

Question 24

Question
What are three benefits of using IPv6? (Choose three.)
Answer
  • A. IPv6 supports a greater level of security by integrating features that were optional addons in IPv4.
  • B. IPv6 reduces administrative overhead using stateless address autoconfiguration for hosts.
  • C. IPv6 eliminates the need for private to public NAT using a large address pool.
  • D. IPv6 provides backward compatibility with IPv4 using the Next Header field.
  • E. IPv6 represents large IP addresses using dotted decimal notation.

Question 25

Question
Which statement is correct about the forwarding table?
Answer
  • A. The forwarding table is stored only on the PFE.
  • B. The forwarding table contains all known routes.
  • C. The forwarding table is stored on both the RE and PFE.
  • D. The forwarding table is stored only on the RE.

Question 26

Question
Which statement describes exception traffic?
Answer
  • A. Exception traffic must be sent to the PFE for processing.
  • B. Exception traffic enters one ingress port and is sent out multiple egress ports.
  • C. Exception traffic is rate-limited on the internal link to prevent DoS attacks.
  • D. Exception traffic is processed after forwarding traffic when congestion exists.

Question 27

Question
What are two benefits of the modular design of the Junos OS? (Choose two.)
Answer
  • A. Each module uses application-specific integrated circuits (ASICs).
  • B. Each module runs in its own protected memory space.
  • C. Each module can be individually restarted.
  • D. Each module is supported across all Junos platforms.

Question 28

Question
Which statement describes the PFE?
Answer
  • A. The PFE controls the RE by providing Layer 2 and Layer 3 forwarding tables.
  • B. The PFE implements advanced services such as policing, stateless firewall filtering, and class of service.
  • C. The PFE sends traffic to the RE for systematic packet forwarding.
  • D. The PFE receives hardware and environmental status messages from the RE.

Question 29

Question
Which process is responsible for the routing protocols on a Junos device?
Answer
  • A. rpd
  • B. mgd
  • C. dcd
  • D. chassisd

Question 30

Question
Which process is responsible for the configuration of the router and all user commands on a Junos device?
Answer
  • A. rpd
  • B. chassisd
  • C. dcd
  • D. mgd

Question 31

Question
How does the PFE handle unicast transit traffic destined for an existing forwarding table entry?
Answer
  • A. It sends the traffic through one egress port toward its destination.
  • B. It sends the traffic through multiple egress ports to all available receivers.
  • C. It sends the traffic through an internal link to the RE.
  • D. It sends the traffic to the local system for further processing.

Question 32

Question
Which two design goals describe the Junos OS design? (Choose two.)
Answer
  • A. clean separation of security and routing policies
  • B. clean separation of control and forwarding planes
  • C. modularization of multiple software processes
  • D. a single hardware platform for all software applications

Question 33

Question
Which two Junos platforms provide stateful firewall functionality? (Choose two.)
Answer
  • A. MX Series
  • B. EX Series
  • C. SRX Series
  • D. QFX Series

Question 34

Question
What are two examples of RE exception traffic? (Choose two.)
Answer
  • A. BGP updates that travel through the local router and are destined for a remote router.
  • B. OSPF hello packets that are sent from a remote router and are destined for the local router.
  • C. Telnet traffic that is sent from a remote host and is destined for the local router.
  • D. Telnet traffic that travels through the local router and is destined for a remote end host.

Question 35

Question
In the Junos OS, what handles transit traffic?
Answer
  • A. Transit traffic is handled by the RE only.
  • B. Transit traffic is handled by the PFE only.
  • C. Transit traffic is handled by both the RE and the PFE.
  • D. Transit traffic is not handled by the RE or the PFE.

Question 36

Question
Which statement describes transit traffic?
Answer
  • A. Traffic addressed to the chassis that requires some form of special handling by the RE before it can be forwarded out an egress port.
  • B. Traffic that enters an ingress port, is compared against the forwarding table, and is forwarded out an egress port.
  • C. Any traffic that requires the generation of an ICMP message.
  • D. Traffic that requires some form of special attention and does not pass through the device.

Question 37

Question
What is the central processing component of the forwarding plane?
Answer
  • A. PFE
  • B. RE
  • C. Junos OS
  • D. forwarding table

Question 38

Question
Which statement is correct regarding the Junos OS?
Answer
  • A. The same Junos OS image is used on all Junos devices.
  • B. The Junos OS provides separation between the control and forwarding planes.
  • C. Each Junos OS image is based on model-specific source code.
  • D. The Junos OS creates a secondary instance of the kernel to ensure redundancy.

Question 39

Question
What are two functions of the RE? (Choose two).
Answer
  • A. to maintain routing tables
  • B. to forward traffic toward its destination
  • C. to manage the PFE
  • D. to implement various services such as policing, stateless firewall filtering, and class of service

Question 40

Question
Which statement is correct regarding exception traffic processing?
Answer
  • A. Exception traffic is only handled by the PFE.
  • B. Exception traffic is rate-limited across the internal link to protect the RE.
  • C. Exception traffic is not prioritized during times of congestion.
  • D. Exception traffic is forwarded based on forwarding table entries.

Question 41

Question
When using keyboard shortcuts, which single keystroke combination allows users to erase the entire current command?
Answer
  • A. Ctrl + a
  • B. Ctrl + e
  • C. Ctrl + u
  • D. Ctrl + w

Question 42

Question
When using keyboard shortcuts, which keystroke combination allows users to erase a single word to the left of the cursor?
Answer
  • A. Ctrl + a
  • B. Ctrl + e
  • C. Ctrl + u
  • D. Ctrl + w

Question 43

Question
What must you type to enter operational mode from the root@% command prompt?
Answer
  • A. exit
  • B. configure
  • C. edit
  • D. cli

Question 44

Question
Which two commands would you use to discard a candidate configuration? (Choose two.)
Answer
  • A. rollback
  • B. delete
  • C. delete 0
  • D. rollback 0

Question 45

Question
Which two statements are true about the configure exclusive command? (Choose two.)
Answer
  • A. It allows users to retain all uncommitted changes when exiting exclusive configuration mode.
  • B. It allows multiple users to edit private copies of the configuration concurrently.
  • C. It causes the loss of all uncommitted changes when exiting exclusive configuration mode.
  • D. It excludes other users from editing the configuration.

Question 46

Question
Which command will display the active configuration?
Answer
  • A. user@router> show configuration
  • B. user@router# show
  • C. user@router> show system configuration
  • D. user@router> show system commit

Question 47

Question
Which three commands will cause a logical interface to go administratively down after being committed? (Choose three.)
Answer
  • A. shutdown
  • B. deactivate
  • C. disable
  • D. down
  • E. delete

Question 48

Question
Which command returns a list of commands in which a given keyword is used throughout the Junos hierarchies?
Answer
  • A. help topic
  • B. help reference
  • C. help apropos
  • D. help tip

Question 49

Question
Which three statements are true regarding the candidate configuration? (Choose three.)
Answer
  • A. The candidate configuration is a temporary configuration that might become the active configuration.
  • B. A candidate configuration is initially populated with the configuration currently active on the system.
  • C. Changes to the candidate configuration take effect immediately.
  • D. The candidate configuration becomes the active configuration after a system reboot.
  • E. The configure private command allows concurrent editing of a candidate configuration by multiple users.

Question 50

Question
-- Exhibit -- [edit] user@router# show | compare [edit protocols ospf area 0.0.0.0] - interface ge-0/0/0.0 { - disable; - } [edit protocols ospf] area 0.0.0.0 { ... } + area 0.0.0.1 { + interface ge-0/0/0.0; + } -- Exhibit -- Referring to the exhibit, what are two differences between the active and candidate configurations? (Choose two.)
Answer
  • A. The ge-0/0/0 interface was added to the candidate configuration.
  • B. Area 0 was added to the active configuration.
  • C. Area 1 was added to the candidate configuration.
  • D. The ge-0/0/0 interface was added to the active configuration.
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