CCNA 200-301 Test
What is the primary purpose of a VLAN? - ✔✔To create a broadcast domain; enable
segmentation or isolation of broadcast traffic
Unassigned Cisco switch ports remain in which VLAN? - ✔✔VLAN 1
Do VLANs
...
CCNA 200-301 Test
What is the primary purpose of a VLAN? - ✔✔To create a broadcast domain; enable
segmentation or isolation of broadcast traffic
Unassigned Cisco switch ports remain in which VLAN? - ✔✔VLAN 1
Do VLANs prevent broadcast storms? - ✔✔No, they minimize the size and effect of the
broadcast storm on neighbor switches and hosts
What are four advantages to using VLANs? - ✔✔1. Enable access to network services
based on logical requirements
2. Network security is optimized with VLANs that enable managing and filtering
sensitive traffic from other network traffic
3. Bandwidth efficiency is accomplished through segmenting traffic into smaller
broadcast domains
4. Easier add/move/delete administration of endpoints on a network and scalability for
larger enterprise deployments
What is the Layer 2 Broadcast Destination Address? - ✔✔FFFF.FFFF.FFFF
What is the Layer 3 Broadcast Destination Address? - ✔✔255.255.255.255
What is VLAN 1 used for and can it be deleted? - ✔✔Management Traffic; it cannot be
deleted
What is the normal VLAN range? - ✔✔VLAN 2 - 1001
What is the extended VLAN range? - ✔✔VLAN 1006 - 4094
What VLANs are auto-created and cannot be deleted? - ✔✔VLAN 1, 1002 - 1005
What VLANs cannot be pruned from a trunk? - ✔✔VLAN 1006 - 4094
How many VLANs can be assigned to a switch access port? - ✔✔Only one VLAN
unless you are connecting an IP phone
What commands would you use to setup a switch access port with an IP phone? -
✔✔interface
switchport mode access
switchport access vlan #
switchport voice vlan #
Where is the switch VLAN configuration stored? - ✔✔vlan.dat file
What commands would you use to globally create and name a VLAN? - ✔✔vlan #
name
What is the default switch port mode? - ✔✔Access port
What will switch access ports do with am Ethernet frame it receives with an 802.1q tag?
- ✔✔It will discard the packet without learning the source MAC address
What command would you use to configure a range of switch ports? - ✔✔interface
range gigabitethernet#/# - #
What command lists all VLANs configured on a switch? - ✔✔show vlan or show vlan
brief
What command is used to display the switch ports assigned to a single VLAN? -
✔✔show vlan id
When are data messages forwarded to the default gateway? - ✔✔When the destination
subnet is on a different subnet than the endpoint
Does the Cisco default switch configuration have an IP default gateway? - ✔✔No
What command is used to create an IP default gateway? - ✔✔ip default-gateway
What is the primary purpose of a switch? - ✔✔To make forwarding decisions based on
destination MAC address
List the network services provided by switches - ✔✔- Only read Ethernet frame headers
and forward traffic
- Create and maintain the MAC address table
- Create separate collision domains per switch port
- Create separate broadcast domains per VLAN
What method was used for detecting Ethernet collisions on older hubs and bridges? -
✔✔Carrier Sense Multiple Access Collision Detection (CSMA/CD)
How many separate MAC address table does a switch create? - ✔✔A switch creates a
separate MAC address table for each configured VLAN
What command lists the contents of the MAC address table for a switch? - ✔✔show
mac address-table
When does a switch begin MAC address learning? - ✔✔When a switch is first started
and connected hosts start sending frames? Also triggered when the aging time expires
for an address
What is the default time that a switch removes MAC address table entries? - ✔✔300
seconds
How do you disable MAC address table aging? - ✔✔Configure the MAC aging timer to
zero
What are the steps when a host sends data to a server on the same VLAN for the first
time? - ✔✔1. Switch adds the source MAC address of incoming frame if it is not listed in
the MAC address table
2. Switch does a MAC address table lookup for the destination MAC address
3. Switch floods a frame using FFFF.FFFF.FFFF as destination MAC address out all
switch ports except the port where the source MAC address was learned
4. Server wit the assigned MAC address responds with a frame that lists the MAC
address
5. Switch updates the MAC address table with the MAC address of the server; That is
the destination MAC address for frames sent from the host
6. Switch forwards the frames from the host to the server based on the switch port
assigned to the server
What is Cut-Through Switching? - ✔✔It is a technique that optimizes performance by
examing only the first 6 bytes (destination MAC address) of an Ethernet frame before
making a forwarding decision. The switch does a MAC address table lookup for the
destination MAC address and forwards the frame.
What is the advantage of Cut-Through Switching? - ✔✔The forwarding decision is made
before all of the frame arrives and thereby minimizes latency
What is Store-and-Forward Switching? - ✔✔Traditional switching where the frame is not
forwarded until all of the frame has arrived. The switch copies the frame to memory
before examining the destination MAC address and forwarding the frame.
What is CEF? - ✔✔Cisco Express Forwarding: Layer 3 switching technique that creates
FIB and adjacency tables for optimized forwarding. It is only available on routers and
switch platforms with routing enabled and the required hardware
What is an FIB? - ✔✔Forwarding Information Base: Used by CEF to mae IP destination
prefix-based switching decisions. Conceptually similar to a routing table or information
base. It maintains a mirror image of the forwarding information contained in the IP
routing table.
Which devices can perform frame rewrite? - ✔✔Layer 3 switches and Wireless LAN
Controllers
Which devices perform frame switching? - ✔✔Layer 2 switches and Access Points
What are the duplex and speed default settings on a switch port? - ✔✔auto-negotiation
What is the purpose of a switch trunk? - ✔✔To forward multiple VLANs between
switches
What command enables trunking on an interface? - ✔✔switchport mode trunk
encapsulation dot1q
What does the native VLAN forward? - ✔✔Control traffic across switch trunks
Why is it recommended to change the native VLAN? - ✔✔This is a Cisco security best
practice as there are security vulnerabilities associated with default VLAN 1; STP issues
are minimized as well by selecting a nondefault VLAN instead of VLAN 1
What command changes the native VLAN? - ✔✔switchport trunk native vlan
What is the purpose of VLAN pruning? - ✔✔To permit or deny VLANs across a switch
trunk
What is the Cisco default for VLAN pruning - ✔✔To allow all VLANs across the trunk
What command sets a range of VLANs to an interface? - ✔✔switchport trunk allowed
vlan <#>-<#>
What are the three modes of DTP? - ✔✔nonegotiate, desirable, auto
Is DTP enabled by default on switch ports? - ✔✔Yes
What does a switch port configured with desirable mode do? - ✔✔Actively sends DTP
frames to negotiate trunk with neighbor switch
What is the operation of switchport mode access? - ✔✔Access port only (no trunk) -
only one VLAN, two if you include a Voice VLAN
What is the operation of switchport mode trunk? - ✔✔Trunk statically formed and no
DTP frames sent
What is the operation of switchport mode dynamic auto? - ✔✔Listens for DTP requests
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