JNCIA

What is the command to compare two arbitrary files?

> file compare files <file1> <file2>

What is the command to save the Active Configuration as the Rescue configuration?

> request system configuration rescue save

What is the command to gracefully shut down a Juniper device?

> request system halt

What is the command to set the idle timeout? What is the default timeout? How is timeout disabled?

> set cli idle-timeout <minutes> ; Default: no timeout ; Disable by setting minutes to 0.

What is the command to set the system date and time?

> set date YYYYMMDDhhmm.s

What is the command to compare the Active Configuration to previous configuration 'n'?

> show configuration | compare rollback n

What does NSR stand for?

Nonstop Active Routing.

What is the command to activate a previously deactivated command?

# activate <xyz-command>

What is the command to add a descriptive statement to a configuration command?

# annotate <command> "descriptive statement"

What is the command to make a Candidate Configuration become the Active Configuration at a set time?

# commit at hh:mm:ss

What is the command to check configuration syntax withing placing the configuration into effect?

# commit check

What is the command in which after a timer expires with out another commit occuring that the device will fallback to the previous configuration?

# commit confirmed <timeout>

What is the command to replicate a Configuration to both Routing engines?

# commit synchronize

What is the command to copy an interface statement to another statement?

# copy interfaces <intf1> to <intf2>

What is the syntax to disable a command but not remove it's configuration?

# deactivate <xyz-command>

What is the command to delete a set command?

# delete <command>

How does one enter the ospf area 0 configuration sub-mode (from the top of the config hierarchy)?

# edit protocols ospf area 0

What is the command to leave Configuration mode and return to Operational mode?

# exit configuration-mode

What is the command to load a configuration file?

# load <option> <filename | terminal>

What is the command to rename X interface to Y interface?

# rename interfaces X to Y

How is the Candidate Configuration saved to an FTP location?

# save ftp:///user:password@host/path/filename

How is the Candidate Configuration saved to a specific location?

# save path/filename

What is the command to save the Candidate Configuration to an ssh location?

# save scp://user@host/path/filename

What is the command to configure an ip address on interface fxp0?

# set interfaces fxp0 unit 0 family inet address a.b.c.d/zz

If the routing process isn't up yet or doesn't start at all, what command will enable ip reachability to a next hop?

# set system back-up router a.b.c.d destination w.x.y.z/zz ;where a.b.c.d is reachable on a directly connected subnet.

What is the command to automatically cause a synchronize whenever a commit is issued?

# set system commit synchronize

What is the command to set the device hostname?

# set system host-name (name) ;or relative: [edit system] # set host-name <name>

What is the command to set the maximum number of configuration versions that will be saved?

# set system max-configurations-on-flash <num> ;or relative: [edit system]# set....

What is the command to set the root password?

# set system root-authentication plain-text-password ;or relative: [edit system]# set...

What are the commands to enable the telnet and ssh services?

# set system services (telnet|ssh) ;or relative: [edit system] # set services (telnet|ssh)

What is the command to set the time-zone?

# set system time-zone (zone) ;or relative: [edit system] # set time-zone <zone>

What is the command to add configuation? For example, you want to add configuration 'thisthatthenext'.

# set thisthatthenext

What is the command to return beginning of the configuration hierarchy?

# top

What is the command to return to a higher level of the configuration hierarchy one level at a time? Multiple levels at a time?

# up 1 ; up N ;where N is number of levels

What is the command to match against multiple statements and delete?

# wildcard delete <xyz>

In reference to configurations, what happens upon entering configuration mode?

Candidate config created, populated with Active config, user modifies Candidate, user commits changes, Candidate becomes Active if syntax verifies.

The JunOS Configuration mode is used to do what?

Configure: interfaces protocols, user access, and system hardware.

Key combo to: move to beginning of line

Control A

Key combo to: move left 1 character?

Control B

Key combo to: delete character over the cursor

Control D

Key combo to: move to end of line

Control E

Key combo to: move right 1 character

Control F

Key combo to: redraw current line.

Control I

Key combo to: delete from cursor to end of line

Control K

Key combo to: recall next command in command history

Control N

Key combo to: recall previous command

Control P

The Control Plane runs on which Engine? The Forwarding Plane?

Control Plane runs on the Routing Engine. Forwarding Plane runs on the Packet Forwarding Engine.

Key combo to: delete all characters & negate current command.

Control U

Key combo to: Delete word to left of character.

Control W

What is the difference between the Active and Candidate configurations?

Difference is whether the config has been committed and in use. Active = comitted and in use. Candidate = doesn't become the Active config until commit command performed.

Because software processes are compartmentalized, that means? (2 things)

Each runs in own protected memory space; new features can be added with less likelihood of breaking current functionality.

Key combo to: Move cursor back one word with no delete.

Esc D

Key combo to: Move cursor forward one word with no delete.

Esc F

What does the command 'configure exclusive' do?

Excludes others from editing the configuration.

How is transit traffic processed?

For platforms running JunOS, forwarded through the PFE based on forwarding table installed on the PFE.

In Juniper architecture, what is the primary function of the forwarding plane?

Forward packets and implement advanced services.

Name 3 High Availability features.

GRES - Graceful Routing Engine Switchover; NSR - Nonstop Active Routing; ISSU - Unified in-service software upgrades

What does GRES stand for?

Graceful Routing Engine Switchover.

What are the four types of interfaces on a Junos device?

Management, Internal, Network, Services.

What is Junos password enforcement criteria?

Minimum 6 characters, including a change of case, digits, or punctuation.

JunOS Operational mode is used to do what?

Monitor & Troubleshoot: the software, network connectivity, and hardware.

What does the command 'configure private' do?

Multiple users can edit the configuration but then commit only their private changes.

Which modes exist in JunOS?

Operational, Configuration, FreeBSD shell.

What does this command do? # save <filename>

Saves the Candidate Configuration (pertaining to the hierarchy level presently at) as a file in the user's home directory.

Define Exception traffic. Give examples.

Traffic destined to the Juniper device itself. Example: routing protocol updates, telnet sessions, traceroutes, replies to sourced traffic, traffic requiring icmp replies.

What is necessary after loading the factory-default configuration?

Set the root password, because a configuration will not commit until this is done.

Which Juniper platforms run JunOS?

These series: M, T, J, MX, EX, SRX

EX series - Ethernet switches. What is the throughput? Give example of deployment.

Throughput: 6.2 Tbps full duplex. Example deployment: low to high density enterprise & data center environments.

SRX series - Services Gateways. What is the throughput? Give example of deployment.

Throughput: up to 120 Gbps of full duplex. Example deployment: to meet network/security requirements for consolidated data centers, managed services deployments, aggregation of security services.

J series - Services routers. What is the throughput? Give example of deployment.

Throughput: up to 2 Gbps. Example deployment: branch and remote locations.

T series - Core routers. What is the throughput? Give example of deployment.

Throughput: up to 25.6 Tbps. Example deployment: service provider core.

M series - Multiservice Routers. How much throughput? Give example of deployment?

Throughput: up to 320 Gbps of aggregate half-duplex throughput. Deploy in high-end enterprise, and service provider environments.

MX series - Ethernet Services Router. What is the throughput? Give example of deployment.

Throughput: up to 960 Gbps of aggregate half-duplex throughput. Example deployment: dense dedicated access aggregation & provider edges services.

What is the spacebar used for?

To complete a command.

What is the tab used for?

To complete a variable.

What does ISSU stand for?

Unified in-service softwar upgrades.

What happens when issuing the 'show' command within a Configuration Sub-mode versus at the top of the Configuration hierarchy?

Within sub-mode: shows only the Candidate config of that sub-mode. At the top level: shows the entire Candidate configuration.

What are the commands to revert to the Rescue configuration?

[edit] # rollback rescue ;then [edit] # commit

What are the three 'help' command options?

help topic <topic> ; help reference <config-statement> ; help apropos <keyword>

What are the four items of the initial configuration checklist?

hostname, system time, system services for remote access (telnet, ssh), management interface & static route for management traffic

In Juniper architecture, what is the primary function of the control plane?

maintain routing intelligence, control and monitor chassis, manage the PFE.

What are the options on the load command?

merge, override, patch, replace, set, update

What is the static route operator that will prevent a prefix from entering a dynamic routing process?

no-readvertise

How is exception traffic processed?

processed locally either by the Routing Engine or by the Packet Forwarding Engine depending on the type of traffic.

What is the command to revert to a previous Configuration?

rollback N ;where N is Nth most recent Configuration.

What is the syntax to issue an Operational mode command from within Configuration mode?

run <xyz> ;where xyz is the command.

What is the command to display the difference between the candidate and active configurations?

show | compare

What command is quickest to return to the uppermost level of the configuration hierarchy?

top

What is the pipe operator to display the number of lines present in resulting command output?

| count

What is the pipe operator to show additional detail about config contents?

| display detail ;(config mode only)

What is the pipe operator to show the commands which created existing configuration?

| display set ;(config mode only)

What is the pipe operator to exclude output matching reg-exp?

| except <reg-exp>

What is the pipe operator to display output starting at first occurrence of reg-exp?

| find <reg-exp>

What is the pipe operator to hold text without exiting --more--?

| hold

What is the pipe operator to display the last screen of information?

| last

What is the pipe operator to search for text matching reg-exp?

| match <reg-exp>

What is the pipe operator to display all output at once?

| no-more

What is the pipe operator to display output to multiple users?

| request message

What is the pipe operator to save output to a file?

| save <filename>

What is the pipe operator to adjust number of columns displayed from the starting line?

| trim <num>