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32 Cards in this Set

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What configuration is typically referred to as a Router-On-A-Stick?
This incorporates a switch and a separate layer 3 device connected by a trunk.
With this configuration, separate sub-interfaces are configured per VLAN on the layer 3 device to provide layer 3 addressing information.
What is the protocol that is typically used to connect a switch and a router in the Router-On-A-Stick configuration?
There are two available trunking protocols that are supported on Cisco equipment: IEEE 802.1Q and Cisco proprietary Inter-Switch Link (ISL).
What Cisco IOS router command is used to set the encapsulation protocol on a sub-interface to 802.1Q?
router(config-subif)#encapsulation dot1q vlan-id
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.
What Cisco IOS command is used to set the native VLAN on a trunk on a router?
switch(config-subif)#encapsulation dot1q vlan-id native
The native VLAN configured must be the same on both sides of the trunk.
What Cisco IOS command is used to set the native VLAN on a trunk on a switch?
switch(config-if)#switchport trunk native vlan vlan-id
The native VLAN configured must be the same on both sides of the trunk.
How many VLANs are associated per Switch Virtual Interface (SVI)?
Only one VLAN is associated per SVI. An SVI is a layer 3 interface used for inter-VLAN routing.
What Cisco IOS command is used to enter the configuration mode for SVIs?
switch(config)#interface vlan vlan-id
Once in this configuration mode, you are able to configure layer 3 parameters to be used.
What Cisco IOS command is used to enable IP routing on a multilayer switch?
switch(config)#ip routing
By default, IP routing is not enabled on multilayer switches.
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?
switch(config-if)#switchport autostate exclude
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.
What Cisco IOS command is used to convert a layer 2 switchport into a layer 3 interface?
switch(config-if)#no switchport
By default, all switchports are configured in layer 2 mode.
What Cisco IOS command is used to create a virtual layer 2 Etherchannel interface?
switch(config)#interface port-channel channel-id
The first step in configuring Etherchannel is to set up a virtual layer 2 interface, which will then be configured with multiple physical interfaces.
What Cisco IOS command is used to configure a physical interface into a virtual Etherchannel interface?
switch(config-if)#channel-group channel-id mode mode
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.
What Cisco IOS command is used to configure which Etherchannel negotiation protocol is to be used?
switch(config-if)#channel-protocol lacp | pagp
In order to configure which Etherchannel negotiation protocol is used, this command is used. By default, Port Aggregation Protocol (PAgP) is used.
What Cisco IOS command is used to create a DHCP pool?
switch(config)#ip dhcp pool pool-name
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.
What Cisco IOS command is used to specify the addresses that will be used by DHCP?
switch(dhcp-config)#network network-subnet network-subnetmask
In order for DHCP to be able to give out addresses, this command must be used to specify which addresses to give out.
What Cisco IOS command is used to specify the default gateway given out to DHCP clients?
switch(dhcp-config)#default-router gateway-ip-address
This command is required if the DHCP clients need to access remote IP networks.
What Cisco IOS command is used to specify the amount of time a DHCP lease is valid?
switch(dhcp-config)#lease {days [hours] [minutes] | infinite}
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.
What Cisco IOS command is used to exclude specific addresses from being given out by DHCP?
switch(config)#ip dhcp excluded-address low-ip-address [high-ip-address]
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.
What Cisco IOS command provides the ability for devices to use a DHCP server that is not on their local network?
switch(config-if)#ip helper ip-address
This command takes the DHCP messages that are broadcast on the local network and sends them via unicast to the configured IP address.
What Cisco IOS command displays all the current DHCP leases?
switch#show ip dhcp binding
This command displays the IP address that was given out, as well as the MAC address of the client and the lease expiration time.
What multilayer switching table is the primary lookup table that includes the source MAC address and inbound port information?
Content Addressable Memory (CAM) table
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.
What multilayer switching table stores ACL, QoS, and other information generally associated with upper layer processing?
Ternary Content Addressable Memory (TCAM) table
A TCAM table is used for high-speed lookups of layer 2, 3, and 4 information, including the information in the CAM table.
Which Cisco switching mode is done completely in software and reads the layer 2 and layer 3 information for each frame completely?
Process switching
Process switching is the most CPU intensive of the switching modes because all frames are processed in software and not hardware.
Which Cisco switching mode processes the first frame for a destination IP network in software and all subsequent frames in hardware?
Fast switching
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.
Which Cisco switching mode is done completely in hardware and utilizes an FIB and adjacency tables to forward frames?
Cisco Express Forwarding (CEF)
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.
What are the two methods used by a layer 3 switch to make forwarding decisions?
Route caching and topology-based switching
Route caching is functionally equivalent to fast switching on Cisco IOS routers. Topology-based switching is equivalent to CEF on Cisco IOS routers.
What are the two different locations that a forwarding decision is made on a switch?
Centralized or distributed
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.
What are the two CEF modes that are supported on Cisco switches?
Central CEF and distributed CEF
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.
What is the main type of adjacency that is used by CEF?
Host-route adjacencies
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.
What are the five different types of special adjacency used with CEF?
Null, Glean, Punt, Discard, and Drop adjacencies
When exception processing is required, one of these adjacencies is cached.
Which Cisco IOS command is used to display entries in the CEF FIB?
switch#show ip cef
This command displays CEF FIB entry information.
What Cisco IOS command is used to display entries in the CEF adjacency table?
switch#show adjacency
This command displays information from the CEF adjacency table. The optional detail keyword includes details such as layer 2 information.