Ccnp Switch 4 Inter-Vlan Route

Front 1

What configuration is typically referred to as a Router-On-A-Stick?

Back 1

This incorporates a switch and a separate layer 3 device connected by a trunk.

Hint 1

With this configuration, separate sub-interfaces are configured per VLAN on the layer 3 device to provide layer 3 addressing information.

Front 2

What is the protocol that is typically used to connect a switch and a router in the Router-On-A-Stick configuration?

Back 2

802.1Q

Hint 2

There are two available trunking protocols that are supported on Cisco equipment: IEEE 802.1Q and Cisco proprietary Inter-Switch Link (ISL).

Front 3

What Cisco IOS router command is used to set the encapsulation protocol on a sub-interface to 802.1Q?

Back 3

router(config-subif)#encapsulation dot1q vlan-id

Hint 3

When using a layer 3 device to route between VLANs, you must configure the encapsulation on each sub-interface and specify what VLAN the sub-interface is assigned to.

Front 4

What Cisco IOS command is used to set the native VLAN on a trunk on a router?

Back 4

switch(config-subif)#encapsulation dot1q vlan-id native

Hint 4

The native VLAN configured must be the same on both sides of the trunk.

Front 5

What Cisco IOS command is used to set the native VLAN on a trunk on a switch?

Back 5

switch(config-if)#switchport trunk native vlan vlan-id

Hint 5

The native VLAN configured must be the same on both sides of the trunk.

Front 6

How many VLANs are associated per Switch Virtual Interface (SVI)?

Back 6

One

Hint 6

Only one VLAN is associated per SVI. An SVI is a layer 3 interface used for inter-VLAN routing.

Front 7

What Cisco IOS command is used to enter the configuration mode for SVIs?

Back 7

switch(config)#interface vlan vlan-id

Hint 7

Once in this configuration mode, you are able to configure layer 3 parameters to be used.

Front 8

What Cisco IOS command is used to enable IP routing on a multilayer switch?

Back 8

switch(config)#ip routing

Hint 8

By default, IP routing is not enabled on multilayer switches.

Front 9

What Cisco IOS command is used to exclude a port from being considered when calculating the line state of an SVI it is part of?

Back 9

switch(config-if)#switchport autostate exclude

Hint 9

A switch calculates the line state of an SVI by checking three different things: Is the VLAN active, does the SVI exist and is it not shutdown, and is at least one switchport configured that is in the Up state? This command removes a specific port from consideration in this calculation.

Front 10

What Cisco IOS command is used to convert a layer 2 switchport into a layer 3 interface?

Back 10

switch(config-if)#no switchport

Hint 10

By default, all switchports are configured in layer 2 mode.

Front 11

What Cisco IOS command is used to create a virtual layer 2 Etherchannel interface?

Back 11

switch(config)#interface port-channel channel-id

Hint 11

The first step in configuring Etherchannel is to set up a virtual layer 2 interface, which will then be configured with multiple physical interfaces.

Front 12

What Cisco IOS command is used to configure a physical interface into a virtual Etherchannel interface?

Back 12

switch(config-if)#channel-group channel-id mode mode

Hint 12

After a virtual layer 2 interface has been created, the second step is to configure individual physical interfaces so that they are combined into a single Etherchannel.

Front 13

What Cisco IOS command is used to configure which Etherchannel negotiation protocol is to be used?

Back 13

switch(config-if)#channel-protocol lacp | pagp

Hint 13

In order to configure which Etherchannel negotiation protocol is used, this command is used. By default, Port Aggregation Protocol (PAgP) is used.

Front 14

What Cisco IOS command is used to create a DHCP pool?

Back 14

switch(config)#ip dhcp pool pool-name

Hint 14

In order for DHCP services to work, a pool must be created that specifies which addresses and options are to be given out to the DHCP clients.

Front 15

What Cisco IOS command is used to specify the addresses that will be used by DHCP?

Back 15

switch(dhcp-config)#network network-subnet network-subnetmask

Hint 15

In order for DHCP to be able to give out addresses, this command must be used to specify which addresses to give out.

Front 16

What Cisco IOS command is used to specify the default gateway given out to DHCP clients?

Back 16

switch(dhcp-config)#default-router gateway-ip-address

Hint 16

This command is required if the DHCP clients need to access remote IP networks.

Front 17

What Cisco IOS command is used to specify the amount of time a DHCP lease is valid?

Back 17

switch(dhcp-config)#lease {days [hours] [minutes] | infinite}

Hint 17

Depending on the specific configuration, it may be required to tune the amount of time that a lease is valid. By default, a lease is valid for one day.

Front 18

What Cisco IOS command is used to exclude specific addresses from being given out by DHCP?

Back 18

switch(config)#ip dhcp excluded-address low-ip-address [high-ip-address]

Hint 18

When a DHCP server is configured, it is typical for the IP addresses of statically configured equipment to be excluded from the available DHCP range. This command can also be used to exclude a single IP address by omitting the high-ip-address parameter.

Front 19

What Cisco IOS command provides the ability for devices to use a DHCP server that is not on their local network?

Back 19

switch(config-if)#ip helper ip-address

Hint 19

This command takes the DHCP messages that are broadcast on the local network and sends them via unicast to the configured IP address.

Front 20

What Cisco IOS command displays all the current DHCP leases?

Back 20

switch#show ip dhcp binding

Hint 20

This command displays the IP address that was given out, as well as the MAC address of the client and the lease expiration time.

Front 21

What multilayer switching table is the primary lookup table that includes the source MAC address and inbound port information?

Back 21

Content Addressable Memory (CAM) table

Hint 21

The CAM table is the primary table that is used by a switch when performing frame forwarding. After this table is populated, the switch is aware of which devices are connected to each port.

Front 22

What multilayer switching table stores ACL, QoS, and other information generally associated with upper layer processing?

Back 22

Ternary Content Addressable Memory (TCAM) table

Hint 22

A TCAM table is used for high-speed lookups of layer 2, 3, and 4 information, including the information in the CAM table.

Front 23

Which Cisco switching mode is done completely in software and reads the layer 2 and layer 3 information for each frame completely?

Back 23

Process switching

Hint 23

Process switching is the most CPU intensive of the switching modes because all frames are processed in software and not hardware.

Front 24

Which Cisco switching mode processes the first frame for a destination IP network in software and all subsequent frames in hardware?

Back 24

Fast switching

Hint 24

When using fast switching, the first frame destined for a specific destination IP network is cached into a hardware fast-switching cache, which is then used for future frames to this destination IP network.

Front 25

Which Cisco switching mode is done completely in hardware and utilizes an FIB and adjacency tables to forward frames?

Back 25

Cisco Express Forwarding (CEF)

Hint 25

CEF is the default switching mode and utilizes a Forwarding Information Base (FIB) and adjacency tables. These are created using information from ARP and other sources, including routing protocols.

Front 26

What are the two methods used by a layer 3 switch to make forwarding decisions?

Back 26

Route caching and topology-based switching

Hint 26

Route caching is functionally equivalent to fast switching on Cisco IOS routers. Topology-based switching is equivalent to CEF on Cisco IOS routers.

Front 27

What are the two different locations that a forwarding decision is made on a switch?

Back 27

Centralized or distributed

Hint 27

When a frame is centrally switched, it is processed by the central route processor and typically controlled by an Application-Specific Integrated Circuit (ASIC). When a frame is distributed switched, it is processed at the port or line card level.

Front 28

What are the two CEF modes that are supported on Cisco switches?

Back 28

Central CEF and distributed CEF

Hint 28

Central CEF works by having all forwarding decisions made by the route processor. With distributed CEF (dCEF), all line cards have identical copies of the FIB and adjacency tables and all decisions are made at the line card.

Front 29

What is the main type of adjacency that is used by CEF?

Back 29

Host-route adjacencies

Hint 29

The next-hop layer 2 addressing information, as well as the link-layer header information, is kept for all FIB entries in the adjacency tables.

Front 30

What are the five different types of special adjacency used with CEF?

Back 30

Null, Glean, Punt, Discard, and Drop adjacencies

Hint 30

When exception processing is required, one of these adjacencies is cached.

Front 31

Which Cisco IOS command is used to display entries in the CEF FIB?

Back 31

switch#show ip cef

Hint 31

This command displays CEF FIB entry information.

Front 32

What Cisco IOS command is used to display entries in the CEF adjacency table?

Back 32

switch#show adjacency

Hint 32

This command displays information from the CEF adjacency table. The optional detail keyword includes details such as layer 2 information.