CCNA 200-301 Test

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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 VL... AN? - ✔✔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 <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 <name_of_vlan> 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 <vlan> 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 <ip_address> 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 <vlan_id> 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 [Show More]

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