CCNA 2 - Chapter 6

Based on the given illustration, the correct mode for the G0-1 port to be assigned according to Cisco's best practices is "trunk". Trunk mode is used to carry multiple VLANs across a single link, allowing for efficient use of network resources. This mode is commonly used in larger networks where there is a need to transmit traffic from multiple VLANs between switches.

The number 10 in the command "encapsulation dot1Q 10 native" represents the VLAN ID. VLANs are used to segment a network into smaller virtual networks, and each VLAN is identified by a unique VLAN ID. In this case, the command is specifying that VLAN 10 is the native VLAN for the sub-interface.

Le type de VLAN utilisé pour indiquer les trafics non étiquetés passant dans un port agrégé est le VLAN natif.

The correct answer is "ID du VLAN natif". When a Cisco switch receives untagged frames on an 802.1Q aggregation port, it is switched by default to the native VLAN ID. The native VLAN is a VLAN that is not tagged and is used for communication between devices that do not support VLAN tagging.

La topologie utilise l'implémentation du routage inter-VLAN appelée "router on a stick". Cette méthode consiste à utiliser un seul routeur pour gérer le trafic entre les différents VLANs en utilisant une seule interface physique. Cela permet d'économiser des ressources en utilisant un seul routeur au lieu de plusieurs et en utilisant une seule interface pour le routage.

The correct answer is "no vlan 20". This command is used to delete a specific VLAN from a switch. By using this command, VLAN 20 will be removed from the switch configuration.

The first step in deleting a VLAN that has switch ports assigned as members is to reassign all the member ports to another VLAN. This ensures that the ports are not left without a VLAN assignment, preventing any disruption in network connectivity. The other options, such as reloading the switch, deleting the vlan.dat file, or saving the current configuration, are not necessary or appropriate for deleting a VLAN with assigned ports.

To support five VLANs using existing inter-VLAN routing, five physical router interfaces need to be configured. Each VLAN requires a separate physical interface to connect to the router for routing traffic between VLANs. Therefore, in this case, there would be one physical interface per VLAN, resulting in a total of five interfaces.

The problem is that the VLAN used by PC-A is not listed in the allowed VLANs on the aggregation. This means that the aggregation is not configured to allow traffic from VLAN 60, which is why PC-A cannot communicate with PC-B.

The most likely error causing the problem is that an incorrect IP address is configured on the interface g0/0.30. This means that the PCs in VLAN 30 cannot communicate properly with the PCs in VLAN 45 because they are on different IP subnets.

The command "switchport trunk allowed VLAN 30" specifies that only VLAN 30 is allowed on the trunk port Fa0-5. This means that any traffic tagged with VLAN 10 or 20 will not be allowed on this port, effectively restricting the allowed VLANs to only VLAN 30.

Les VLAN à plage normale sont stockés dans la mémoire flash d'un commutateur Cisco par défaut. La mémoire flash est utilisée pour stocker le système d'exploitation, les fichiers de configuration et d'autres données importantes. Cette mémoire est non-volatile, ce qui signifie que les données ne sont pas perdues lorsque le commutateur est éteint ou redémarré. En stockant les VLAN à plage normale dans la mémoire flash, ils peuvent être persistants et disponibles même après un redémarrage du commutateur.

Le VLAN de gestion est un type de VLAN particulier qui permet à un administrateur d'accéder à un commutateur et de le configurer. Cela permet à l'administrateur de gérer les paramètres du commutateur, tels que les adresses IP, les VLANs, les ports, etc. Le VLAN de gestion est souvent configuré avec des paramètres de sécurité plus élevés pour limiter l'accès uniquement aux administrateurs autorisés.

The correct answer is 4 because each VLAN in the illustration needs to be routed and each VLAN requires its own sub-interface. Therefore, the network admin needs to create 4 sub-interfaces on the router to configure the Router-on-a-Stick model for the illustrated networks.

The correct answer is "La commande encapsulation dot1Q 20 n'a pas été configurée." This is because the error in the inter-VLAN routing configuration on the CiscoVille router is caused by the absence of the "encapsulation dot1Q 20" command. This command is used to configure the VLAN trunking protocol on the interface, allowing the router to route traffic between different VLANs. Without this command, the router is unable to perform inter-VLAN routing.

Lors de la configuration d'un routeur dans une topologie de routage inter-VLAN router-on-a-stick, l'adresse IP doit être attribuée à la sous-interface. Cette configuration permet au routeur de gérer plusieurs VLANs sur une seule interface physique en utilisant des sous-interfaces virtuelles. Chaque sous-interface est associée à un VLAN spécifique et doit avoir une adresse IP correspondante pour communiquer avec les autres VLANs.

To ensure voice quality when introducing Cisco IP phones into a network, a separate VLAN is required for voice traffic. This allows for the prioritization and efficient handling of voice packets, ensuring a smooth and uninterrupted voice communication experience. By separating voice traffic from data traffic, the network can prioritize voice packets and allocate the necessary resources to maintain high-quality voice calls.

The correct answer is "show VLAN." This command is used to display the VLAN assignments of all ports as well as all existing VLANs on the switch. It provides information about how VLANs are configured on the switch and which ports are assigned to each VLAN. By using this command, network administrators can easily view and manage VLAN configurations on the switch.

To resolve the issue, the VLAN 20 needs to be allowed on the trunk link between SW1 and SW2. By allowing the VLAN 20 on the trunk link, the traffic from the workstations connected to SW1 will be able to reach the workstations connected to SW2. This will ensure that the VLAN 20 is allowed to pass through the trunk link and enable communication between the two switches.

If the command "NO SWITCHPORT ACCESS VLAN 30" is entered on interface Fa0-11, the port Fa0-11 is returned to VLAN 1.

To remove port FA0-1 from VLAN 2 and assign it to VLAN 3, the network administrator should enter the command "switchport access vlan 3" in interface configuration mode. This command configures the port to belong to VLAN 3 as an access port.

The correct answer states that the disadvantage of using router on a stick for inter-VLAN routing is that it does not scale well beyond 50 VLANs. This means that as the number of VLANs increases, the router on a stick method becomes less efficient and may not be able to handle the increased traffic effectively.

The command "switchport access vlan 99" is used to assign a specific port to a particular VLAN. This means that any device connected to that port will be part of VLAN 99 and will communicate with other devices in the same VLAN.

The correct answer is "Le routeur nécessite une liaison Ethernet pour chaque VLAN" which means "The router requires an Ethernet connection for each VLAN." This means that in order to enable inter-VLAN routing, the router needs to have a separate Ethernet connection for each VLAN. This allows the router to communicate with each VLAN and route traffic between them.

Lorsque l'administrateur retire le VLAN 10 du commutateur, le port associé à ce VLAN devient inactif. Cela signifie que le port ne sera plus utilisé pour la communication sur le réseau. Il ne sera pas associé automatiquement à un autre VLAN ou au VLAN natif, et il ne créera pas de nouveau VLAN.

A router with at least two LAN interfaces is necessary to allow communication between VLAN 10 and VLAN 20 using the existing inter-VLAN routing. The router needs to have separate interfaces for each VLAN in order to route traffic between them.

Un administrateur réseau utiliserait la commande "show interfaces trunk" sur un commutateur pour afficher le VLAN natif. Cette commande permet de vérifier la configuration des tronçons de liaison (trunks) sur le commutateur et d'afficher les informations relatives aux VLANs qui y sont configurés. En affichant le VLAN natif, l'administrateur peut s'assurer que les tronçons de liaison sont correctement configurés pour le trafic VLAN.

The correct answer is "switchport trunk native vlan 66". This command should be added to Fa0/1 on DLS1 to resolve the problem. By setting the native VLAN to 66, it ensures that untagged traffic from both hosts on VLAN 99 can be properly transmitted between DLS1 and DLS2.

The router will transmit the packet to the Fa0-1.2 interface.

Les principaux avantages de l'utilisation des VLAN sont la réduction des coûts, la sécurité et l'efficacité accrue du personnel informatique. Les VLAN permettent de regrouper des appareils en fonction de leurs besoins de communication, ce qui peut réduire les coûts liés à la gestion des réseaux. De plus, les VLAN peuvent améliorer la sécurité en limitant l'accès aux ressources réseau uniquement aux utilisateurs autorisés. Enfin, l'utilisation des VLAN peut permettre au personnel informatique de gérer plus efficacement le réseau en simplifiant la configuration et la gestion des appareils.

The correct answer is "Ils sont enregistrés par défaut dans le fichier de configuration en cours" and "Les ID de VLAN existent entre 1006 et 4094." This means that extended VLANs are automatically saved in the current configuration file and their IDs range from 1006 to 4094. This information suggests that extended VLANs have specific characteristics related to their configuration and identification within a network.

The correct answer is "Entre deux commutateurs utilisant plusieurs VLAN" and "Entre un commutateur et un serveur équipé d'une carte réseau 802.1Q". These types of point-to-point connections utilize VLAN aggregation because they involve multiple VLANs. VLAN aggregation allows for the consolidation of multiple VLANs into a single physical link, which improves efficiency and reduces the number of physical connections required. In the case of two switches sharing multiple VLANs or a switch connected to a server with a 802.1Q network card, VLAN aggregation would be necessary to handle the traffic between the different VLANs.

To establish communication between VLAN15 and VLAN30 using a router-on-a-stick topology, a switch with a port configured as a trunk port is necessary. This trunk port will connect to the router, allowing traffic from both VLANs to pass through the router and be routed between them. The trunk port will carry the traffic from both VLANs, maintaining the separation between them while allowing communication between them through the router.