CCNA 200-301 Exam Questions And Answers Graded A+!!!

What is the primary purpose of a VLAN? - ANS To create a broadcast domain; enable segmentation or isolation of broadcast traffic Unassigned Cisco switch ports remain in which VLAN? - ANS VLAN 1 Do VLANs prevent broadcast storms? - ANS No, they minimize the size and effect of the broadcast storm on neighbor switches and hosts What are four advantages to using VLANs? - ANS 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? - ANS FFFF.FFFF.FFFF What is the Layer 3 Broadcast Destination Address? - ANS 255.255.255.255 What is VLAN 1 used for and can it be deleted? - ANS Management Traffic; it cannot be deleted What is the normal VLAN range? - ANS VLAN 2 - 1001 What is the extended VLAN range? - ANS VLAN What VLANs are auto-created and cannot be deleted? - ANS VLAN 1, What VLANs cannot be pruned from a trunk? - ANS VLAN How many VLANs can be assigned to a switch access port? - ANS 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? - ANS interface interface#/# switchport mode access switchport access vlan # switchport voice vlan # Where is the switch VLAN configuration stored? - ANS file What commands would you use to globally create and name a VLAN? - ANS vlan # name name_of_vlan What is the default switch port mode? - ANS Access port What will switch access ports do with am Ethernet frame it receives with an 802.1q tag? - ANS It will discard the packet without learning the source MAC address What command would you use to configure a range of switch ports? - ANS interface range gigabitethernet#/# - # What command lists all VLANs configured on a switch? - ANS show vlan or show vlan brief What command is used to display the switch ports assigned to a single VLAN? - ANS show vlan id vlan When are data messages forwarded to the default gateway? - ANS When the destination subnet is on a different subnet than the endpoint Does the Cisco default switch configuration have an IP default gateway? - ANS No What command is used to create an IP default gateway? - ANS ip default-gateway ip_address What is the primary purpose of a switch? - ANS To make forwarding decisions based on destination MAC address List the network services provided by switches - ANS - 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? - ANS Carrier Sense Multiple Access Collision Detection (CSMA/CD) How many separate MAC address table does a switch create? - ANS 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? - ANS show mac address-table When does a switch begin MAC address learning? - ANS 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? - ANS 300 seconds How do you disable MAC address table aging? - ANS 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? - ANS 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? - ANS 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? - ANS The forwarding decision is made before all of the frame arrives and thereby minimizes latency What is Store-and-Forward Switching? - ANS 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? - ANS 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? - ANS 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? - ANS Layer 3 switches and Wireless LAN Controllers Which devices perform frame switching? - ANS Layer 2 switches and Access Points What are the duplex and speed default settings on a switch port? - ANS auto-negotiation What is the purpose of a switch trunk? - ANS To forward multiple VLANs between switches What command enables trunking on an interface? - ANS switchport mode trunk encapsulation dot1q What does the native VLAN forward? - ANS Control traffic across switch trunks Why is it recommended to change the native VLAN? - ANS 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? - ANS switchport trunk native vlan vlan_id What is the purpose of VLAN pruning? - ANS To permit or deny VLANs across a switch trunk What is the Cisco default for VLAN pruning - ANS To allow all VLANs across the trunk What command sets a range of VLANs to an interface? - ANS switchport trunk allowed vlan #-# What are the three modes of DTP? - ANS nonegotiate, desirable, auto Is DTP enabled by default on switch ports? - ANS Yes What does a switch port configured with desirable mode do? - ANS Actively sends DTP frames to negotiate trunk with neighbor switch