Which statement about Cisco Express Forwarding is true?

• A.It uses a fast cache that is maintained in a router data plane.
• B.it maintains two tables in the data plane the FIB and adjacency table.
• C.It makes forwarding decisions by a process that is scheduled through the IOS scheduler.
• D.The CPU of a router becomes directly involved with packet-switching decisions.

Correct Answer: B

Reference:
Cisco Express Forwarding (CEF) provides the ability to switch packets through a device in a very quick and efficient way while also keeping the load on the router's processor low. CEF is made up of two different main components: the Forwarding Information Base (FIB) and the Adjacency Table. These are automatically updated at the same time as the routing table.
The Forwarding Information Base (FIB) contains destination reachability information as well as next hop information. This information is then used by the router to make forwarding decisions.
The FIB allows for very efficient and easy lookups. Below is an example of the FIB table:

The adjacency table is tasked with maintaining the layer 2 next-hop information for the FIB. An example of the adjacency table is shown below:

It uses a fast cache that is maintained in a router data plane' fast cache is only used when fast switching is enabled while CEF is disabled.

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Why would an engineer use YANG?

• A.to access data using SNMP
• B.to transport data between a controller and a network device
• C.to translate JSON into an equivalent XML syntax
• D.to model data for NETCONF

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On which protocol or technology is the fabric data plane based in Cisco SD-Access fabric?

• A.LISP
• B.IS-IS
• C.Cisco TrustSec
• D.VXLAN

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A network administrator applies the following configuration to an IOS device.

What is the process of password checks when a login attempt is made to the device?

• A.A TACACS+server is checked first. If that check fail, a database is checked?
• B.A TACACS+server is checked first. If that check fail, a RADIUS server is checked. If that check fail. a local database is checked.
• C.A local database is checked first. If that fails, a TACACS+server is checked, if that check fails, a RADUIS server is checked.
• D.A local database is checked first. If that check fails, a TACACS+server is checked.

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While configuring an IOS router for HSRP with a virtual IP of 10 1.1.1. an engineer sees this log message.

Which configuration change must the engineer make?

• A.Change the HSRP group configuration on the remote router to 1.
• B.Change the HSRP virtual address on the remote router to 10.1.1.1.
• C.Change the HSRP group configuration on the local router to 1.
• D.Change the HSRP virtual address on the local router to 10.1.1.1.

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