Cisco IOS XR - Important Information

 

Cisco IOS XR Q&A Summary

Question 1

How many line card slots does the Cisco 8812 router have, including RP slots, and how many RU of space does it occupy?

Correct Answer: The Cisco 8812 router has 12 slots in total (including RP slots) and occupies 21 RU of space.

Explanation: The Cisco 8812 is a modular router with 12 slots for line cards and route processors. It is designed for high-performance networking and occupies 21 rack units (RU) in a standard equipment rack.

Question 2

Which two general types of deployment exist for the Cisco IOS XRd router? (Choose two.)

Options:

·       - Cisco IOS XRd Router

·       - Cisco IOS XRd Control Plane

·       - Cisco IOS XRd PCE

·       - Cisco IOS XRd Route Reflector

·       - Cisco IOS XRd vRouter

Correct Answers: Cisco IOS XRd Control Plane, Cisco IOS XRd vRouter

Explanation: Cisco IOS XRd supports two main deployment models: Control Plane (for route reflector and PCE use cases) and vRouter (includes control plane and virtual forwarder for full routing and forwarding capabilities).

Question 3

Into which three planes is Cisco IOS XR Software partitioned? (Choose three.)

Options:

·       - Control

·       - Admin

·       - Process

·       - Data

·       - Management

Correct Answers: Control, Data, Management

Explanation: Cisco IOS XR is partitioned into Control Plane (routing protocols), Data Plane (packet forwarding), and Management Plane (configuration and monitoring).

Question 4

Which three of the following user groups are typically predefined in Cisco IOS XR? (Choose three.)

Options:

·       - root-system

·       - root-lr

·       - admins

·       - cisco-support

·       - configurator

Correct Answers: root-system, root-lr, cisco-support

Explanation: Predefined user groups in IOS XR include root-system (full admin), root-lr (local route control), and cisco-support (diagnostics).

Question 5

Which command allows you to check Task permissions assigned to the user that is currently logged in?

Options:

·       - show users

·       - show tasks

·       - show user tasks

·       - show permissions

Correct Answer: show user tasks

Explanation: The 'show user tasks' command displays task permissions for the current user in IOS XR.

Question 6

Which command displays the difference between target and running configuration?

Options:

·       - show configuration

·       - show configuration running-config

·       - show configuration commit changes

·       - show configuration changes

Correct Answer: show configuration changes

Explanation: This command shows the differences between the target configuration and the running configuration in IOS XR.

Question 7

What routing protocol session is required between two PEs to exchange VPNv4 routes?

Options:

·       - external BGP

·       - OSPF

·       - IS-IS

·       - MP-IBGP

Correct Answer: MP-IBGP

Explanation: MP-IBGP (Multiprotocol IBGP) is used between PE routers to exchange VPNv4 routes in MPLS Layer 3 VPNs.

Question 8

What is the generic name of the protocol running between a CE device and the service provider's MPLS network?

Options:

·       - CE protocol

·       - PE-CE protocol

·       - VRF

·       - OSPFv3

Correct Answer: PE-CE protocol

Explanation: The PE-CE protocol refers to the routing protocol used between the Provider Edge and Customer Edge routers, which can be static, BGP, OSPF, etc.

Question 9

In MPLS networks, which device type does the service provider typically not own?

Options:

·       - CE

·       - PE

·       - P

·       - RR

Correct Answer: CE

Explanation: The CE (Customer Edge) router is typically owned and managed by the customer, not the service provider.

Question 10

Which three software packaging formats does Cisco IOS XR support? (Choose three.)

Options:

·       - .iso

·       - .bin

·       - .rpm

·       - .tar

·       - .exe

Correct Answers: .iso, .rpm, .tar

Explanation: Cisco IOS XR supports .iso (installation), .rpm (modular packages), and .tar (bundled files). .bin and .exe are not used in IOS XR.

Question 11

How do you perform software downgrade on Cisco IOS XR?

Options:

·       - With the install downgrade command.

·       - By installing the software package with the argument downgrade.

·       - By installing and activating an older software version.

·       - By rebooting the Admin VM with an argument downgrade.

Correct Answer: By installing and activating an older software version.

Explanation: Downgrading in IOS XR is done by installing and activating an older version of the software using standard install commands.

Question 12

Which command should you use to check Cisco-certified upgrade and downgrade paths on Cisco IOS XR software?

Options:

·       - show upgrade-matrix

·       - show upgrade paths

·       - show install upgrade-matrix running

·       - show install software

Correct Answer: show install upgrade-matrix running

Explanation: This command displays the certified upgrade and downgrade paths for the currently running IOS XR version.