JNCIA- Junos Cert prep Questions 1-50

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

A. 10.13.128.0

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

A. 213.66.127.194

Which statement is correct regarding IPv6 addresses? 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

A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.

The IP address 10.1.1.1 belongs to which class of IP address space? A. Class A B. Class B C. Class C D. Class D

A. Class A

What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.) 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

A. End hosts determine the path MTU for IPv6. C. Packet fragmentation occurs at intermediate nodes for IPv4.

What are three benefits of using IPv6? (Choose three.) A. IPv6 supports a greater level of security by integrating features that were optional add-ons 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

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

How does the PFE handle unicast transit traffic destined for an existing forwarding table entry? 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.

A. It sends the traffic through one egress port toward its destination.

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

A. MX Series C. SRX Series

Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.) 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.

B. LSPs are unidirectional D. LSPs can follow paths other than the IGP's shortest path.

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

A. PFE

Which two statements are true about optical networks? (Choose two.) 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.

A. SONET and SDH both use time-division multiplexing. D. An optical transport network system uses wavelength-division multiplexing.

Which two statements are true about TCP communication? (Choose two.) 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.

A. The receiver acknowledges the final packet in each communications stream. C. The sender adds sequencing numbers to the packets it sends.

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

A. UDP is faster than TCP. B. UDP operates at the Transport Layer. D. UDP data is sent best-effort.

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

A. fixed header size

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.) A. packet segmentation B. serialized checking C. packet sequencing D. parallel checking

A. packet segmentation C. packet sequencing

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

A. rollback D. rollback 0

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

A. rpd

What are two functions of the RE? (Choose two). 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

A. to maintain routing tables C. to manage the PFE

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

A. user@router> show configuration

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

B. 14

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 A. 192.168.0.0/23 B. 192.168.0.0/22 C. 192.168.0.0/24 D. 192.168.0.0/21

B. 192.168.0.0/22 D. 192.168.0.0/21

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

B. 4

What are two benefits of the modular design of the Junos OS? (Choose two.) 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.

B. Each module runs in its own protected memory space. C. Each module can be individually restarted.

Which statement is correct regarding exception traffic processing? 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

B. Exception traffic is rate-limited across the internal link to protect the RE.

For the interface ge-1/2/3.4, what does "ge" represent? A. SONET/SDH B. Gigabit Ethernet C. Aggregated Ethernet D. GRE

B. Gigabit Ethernet

What are two examples of RE exception traffic? (Choose two.) 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.

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.

Which statement is correct regarding the Junos OS? 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.

B. The Junos OS provides separation between the control and forwarding planes.

Which statement describes the PFE? 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

B. The PFE implements advanced services such as policing, stateless firewall filtering, and class of service

Which statement describes transit traffic? A. Traffic addressed to the chassis that requires some form of special handling by the RE before it can be orwarded 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.

B. Traffic that enters an ingress port, is compared against the forwarding table, and is forwarded out an egress port.

In the Junos OS, what handles transit traffic? 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.

B. Transit traffic is handled by the PFE only.

Which two design goals describe the Junos OS design? (Choose two.) 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

B. clean separation of control and forwarding planes C. modularization of multiple software processes

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

B. deactivate C. disable E. delete

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

C. 11110010 10101000 01011110 01111100

Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64? 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

C. 2001:0:1000::cbff:20:1/64

What is a valid IPv6 address? 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

C. 2001:0db8:3000:2215:0000:0000:aaaa:1111

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

C. 218.6.127.254

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

C. Ctrl + u

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

C. Data Link Layer

Which statement describes exception traffic? 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.

C. Exception traffic is rate-limited on the internal link to prevent DoS attacks.

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

C. Internet Layer

Which two statements are true about the configure exclusive command? (Choose two.) 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.

C. It causes the loss of all uncommitted changes when exiting exclusive configuration mode. D. It excludes other users from editing the configuration

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

C. Layer 4

Which statement is correct about the forwarding table? 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.

C. The forwarding table is stored on both the RE and PFE.

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

C. help apropos

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

C. show

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

D. Ctrl + w

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

D. cli

In the exhibit, there are four static routes that route traffic through different interfaces. 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 Which interface does the router use if traffic is sent to the 99.0.0.1 destination? A. ge-0/0/1 B. ge-0/0/2 C. ge-0/0/3 D. ge-0/0/4

D. ge-0/0/4

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

D. mgd

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

D. user@router>