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

Explanation
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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Refer to the exhibit.

A port channel is configured between SW2 and SW3. SW2 is not running a Cisco operating system. When all physical connections are made, the port channel does not establish.
Based on the configuration except of SW3, what is the cause of the problem?

• A.The port-channel trunk is not allowing the native VLAN.
• B.The port-channel interface load balance should be set to src-mac.
• C.The port channel on SW2 is using an incompatible protocol.
• D.The port-channel mode should be set to auto.

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Refer to the exhibit.

An engineer must set up connectivity between a campus aggregation layer and a branch office access layer.
The engineer uses dynamic trunking protocol to establish this connection, however, management traffic on VLAN1 is not passing. Which action resolves the issue and allow communication for all configured VLANs?

• A.Configure the correct native VLAN on the remote interface
• B.Change both interfaces to access ports.
• C.Disable Spanning Tree for the native VLAN.
• D.Allow all VLANs on the trunk links

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What does the number in an NTP stratum level represent?

• A.The number of hops it takes to reach the master time server.
• B.The number of hops it takes to reach the authoritative time source.
• C.The amount of offset between the device clock and true time.
• D.The amount of drift between the device clock and true time.

Correct Answer: B

Explanation
NTP uses the concept of a stratum to describe how many hops (routers) away a machine is from an authoritative time source, usually a reference clock. A reference clock is a stratum 0 device that is assumed to be accurate and has little or no delay associated with it. Stratum 0 servers cannot be used on the network but they are directly connected to computers which then operate as stratum-1 servers. A stratum 1 time server acts as a primary network time standard.

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Which statement about TLS is true when using RESTCONF to write configurations on network devices?

• A.It required certificates for authentication.
• B.It is used for HTTP and HTTPs requests.
• C.It is not supported on Cisco devices.
• D.It is provided using NGINX acting as a proxy web server.

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