SSH and Operational Mode

Question 1

What four pieces of information are needed to connect remotely to a network device?

Answer 1

1. A protocol to use
2. A username
3. A password
4. The IP address of the device.

Question 2

What is the difference between Telnet and SSH?

Answer 2

1. Telnet
   a. Uses clear text and unencrypted
   b. Uses TCP port 23
2. SSH
   a. encrypted
   b. Uses TCP port 22

Question 3

When you SSH to a Junos device, what do you see?

Answer 3

1. You will be prompted for a password
2. The last time you logged in
3. The Junos OS kernel version.

Question 4

When you SSH to a Junos device as a root user, what mode will you be placed into?

Answer 4

1. The Linix/Unix shell prompt

Question 5

When you SSH to a Junos device as non-root user, what mode will you be placed into?

Answer 5

1. Operational mode

Question 6

What are the two main Junos CLI modes?

Answer 6

1. Operational
   a. You can verify and troubleshoot
   b. Verify protocols
   c. Confirm an interface is working
   d. Read the configuration
   e. Verify system/hardware status
   f. Upgrade device software
   g. Shut down/reboot the device
   h. Clear up old files
   i. Generate “support information”
   j. Use ping and traceroute
   k. Read log files
   l. Clear interface rounters
   m. View protocol traffic in real-time
2. Configuration
   a. You can configure the device

Question 7

Many operational mode command begin with one of four following words.

Answer 7

1. Show
2. Monitor
3. Clear
4. Request

Question 8

What is the difference between the ‘show’ and ‘monitor’ commands?

Answer 8

1. ‘show’ gives you a static snapshot of information in the moment that you type it.
2. ‘monitor’ displays real-time info that refreshes and updates automatically.

Question 9

Describe the ‘clear’ command.

Answer 9

1. Clears interface counters, clears log files, restart protocol state.

Question 10

Describe the ‘request’ command.

Answer 10

1. Performs admin tasks - upgrades, reboots, switches between dual routing engines.

Question 11

Where is one area that displays the host-name?

Answer 11

1. The cli prompt

Question 12

Which command allows you to see the device’s current time, up-time, system boot and protocols start time?

Answer 12

1. op mode - show system uptime

Question 13

Which command shows the device’s model, family, OS version and host-name?

Answer 13

1. op mode - show system information

Question 14

In the naming of the OS version, R1, R2, R3, S1, S2 represent what?

Answer 14

Question 15

‘LLDP’ is the acronym for?

Answer 15

1. Link Layer Discovery Protocol
   a. A protocol that devices can use to discover other devices connected to them.

Question 16

LLDP provides what information about a device?

Answer 16

1. Hostname
2. Port names
3. MAC addresses
4. Power over Ethernet abilities
5. Vendor name

Question 17

Which command displays neighbors of a device?

Answer 17

1. op mode - show lldp neighbors

Question 18

Which symbol displays all commands available to you?

Answer 18

1. ? - Question mark

Question 19

Which two keystrokes will auto-complete a command?

Answer 19

1. Spacebar
   a. Will only auto-complete commands
2. Tab
   a. Will auto-complete command variables you’ve configured such as firewall rules, named list of IP address, etc

Question 20

Junos OS is a hierarchial structure, True of False?

Answer 20

True