Learn French In This Language Quiz!

SSH (Secure Shell) est un protocole qui fournit une connexion chiffrée. Il remplace le protocole Telnet en texte clair pour la gestion des périphériques Cisco. SSH utilise des techniques de cryptographie pour sécuriser les communications entre le client et le serveur, en garantissant la confidentialité et l'intégrité des données échangées. Grâce à son chiffrement, SSH protège contre les attaques de type "man-in-the-middle" et permet une gestion sécurisée des périphériques Cisco.

The continuous green light on the port indicates that it is operational and ready to transmit packets.

The conclusion drawn from the partial result of the "show running-config" command is that it appears to be the default configuration of the switch.

This answer reflects the accurate functioning of the link because the question mentions that the switch and workstation are configured for simultaneous bidirectional operation. In this configuration, collisions are eliminated because the switch manages the traffic flow and ensures that only one device transmits data at a time. This prevents collisions and allows for smooth communication between the switch and the workstation.

The correct answer is 100%. In Ethernet bidirectional mode, the bandwidth is fully utilized in both directions simultaneously, resulting in maximum efficiency. This means that the network can transmit and receive data at its full capacity without any loss or waste of bandwidth.

The correct answer is 22. Port number 22 is the standard port for SSH (Secure Shell) protocol, which is used for secure remote administration of network devices. By opening and monitoring port 22 on the university's firewall, the network administrators at the central office can manage a remote switch for SSH traffic.

The first action in the boot-up sequence when a switch is powered on is the loading of a Power-On Self Test (POST) program. This program is responsible for checking the hardware components of the switch to ensure they are functioning properly. It performs diagnostic tests on the switch's processor, memory, and other components. Once the POST is completed successfully, the switch can proceed to the next steps in the boot-up process, such as loading the default Cisco IOS software.

La commande "switchport port-security" permet d'activer la sécurité des ports sur une interface spécifique. Cela signifie que seules les adresses MAC autorisées seront autorisées à se connecter à cette interface, et toute autre adresse MAC sera bloquée. Cela aide à prévenir les attaques de type "spoofing" où un appareil malveillant tente de se faire passer pour un appareil autorisé en utilisant une adresse MAC falsifiée.

The correct answer is "Il doit modifier la commande transport input." This is because the "transport input" command is used to specify the protocols that are allowed for incoming connections. By modifying this command, the network administrator can specify that only SSH is allowed and Telnet is prohibited.

Telnet sends the username and password in clear text, which means that anyone who intercepts the communication can easily read and capture the credentials. On the other hand, SSH encrypts the username and password, providing a secure connection between the client and the server. This ensures that even if someone intercepts the communication, they won't be able to decipher the credentials.

When all switch ports are configured for port security and the violation mode is set to the default factory settings, any packets with an unknown source address will be dropped. Additionally, the interface error logging and LED port status indicators will be disabled. This helps to prevent the pirate from gaining unauthorized access to the network and ensures that any security violations are not easily detectable.

Connecting a host to an interface assigned to VLAN 99 will reactivate the line protocol. The line protocol is responsible for establishing and maintaining the connection between devices on a network. In this case, the line protocol for VLAN 99 is currently disabled, indicating that there is no active connection. By connecting a host to an interface assigned to VLAN 99, the line protocol will be activated, allowing for communication and network connectivity.

The correct answer is "La vitesse et le mode bidirectionnel de l'interface doivent être configurés pour la fonction de détection automatique." This means that in order for the auto-MDIX function to work on a switch interface, the speed and duplex mode of the interface need to be configured for auto-detection. This allows the interface to automatically detect and adjust the necessary settings for proper communication with the connected device.

In case of a security violation on interface Fa0/1 of switch S1, the packets with unknown source addresses are dropped or abandoned. This means that any packets coming from an unknown or unauthorized source will not be forwarded or processed by the switch.

Dans une connexion Ethernet, les collisions se produisent lorsque deux appareils tentent de transmettre des données en même temps sur le même canal. Dans ce cas, si une extrémité de la connexion est configurée en mode full duplex (capable de transmettre et de recevoir des données simultanément) et l'autre extrémité est configurée en mode semi-duplex (capable de transmettre ou de recevoir des données à un moment donné), les collisions tardives se produiront sur l'extrémité de la connexion en mode semi-duplex. Cela se produit car l'extrémité en mode full duplex peut transmettre et recevoir des données simultanément, tandis que l'extrémité en mode semi-duplex ne peut le faire qu'à tour de rôle, ce qui peut entraîner des collisions tardives.

Dans un réseau Ethernet, les trames inférieures à 64 bits sont appelées des "runts". Les runts sont des trames qui sont trop courtes pour être correctement traitées par les équipements du réseau. Ces trames peuvent être causées par des erreurs de transmission ou des collisions.

The correct answer is "restrict". In this scenario, the network administrator wants to limit the number of MAC addresses allowed on each access port to a maximum of two. When the maximum number of MAC addresses is reached, any frame with an unknown source MAC address will be dropped and a notification will be sent to the Syslog server. The "restrict" mode of security violation should be configured on each access port to enforce this policy.

The correct answer is "boot system". This command is used to define the environment variable BOOT, which sets the location of the IOS image file on a switch.

When the command "no switchport port-security mac-address sticky" is executed on an interface where port security is configured, the permanent secure MAC addresses remain in the MAC address table but are removed from the current configuration. This means that the MAC addresses will still be recognized and allowed through the interface, but they will no longer be part of the port security configuration.

L'interface par défaut de l'adresse IP utilisée pour gérer un commutateur Ethernet 24 ports est le VLAN 1.

Une carte réseau défaillante peut être la cause possible des trames Ethernet tronquées lors de l'utilisation d'un commutateur. Cela peut se produire si la carte réseau présente un dysfonctionnement matériel ou logiciel, ce qui entraîne une transmission incorrecte ou incomplète des trames Ethernet. Cela peut entraîner des erreurs de transmission et des trames tronquées.

The most common reason why a network technician sees the Cisco switch prompt "switch:" after the switch has booted up is because the switch's operating system is not found. This could be due to a variety of reasons such as a corrupted or missing operating system file, a failed boot process, or a hardware issue. In order to resolve this issue, the technician would need to troubleshoot the switch's boot process, potentially reinstall the operating system, or replace any faulty hardware components.

The correct answer states that if the LED is green, the port is operating at 100 Mbit/s. This means that when the LED on the speed ports of the Cisco Catalyst 2960 switch is green, it indicates that the port is functioning at a speed of 100 Mbit/s.

The correct configuration for the Fa0/2 port is to enable port security, set the maximum number of allowed MAC addresses to 2, and configure sticky MAC addresses. This ensures that only the IP phone and PC are allowed to be connected to the port, and if any other device is connected, the port will be shut down. The sticky MAC addresses feature automatically detects and adds the MAC addresses of the IP phone and PC to the current configuration, providing an extra layer of security.

The function of the switch's boot program is to provide an operating environment when the switch's operating system is not found.

Based on the information presented, the conclusion that can be drawn about the security of the ports is that the default violation mode is used for any port with security enabled. This means that if any violation of the security settings occurs, such as a device with a different MAC address being connected to the port, the default action will be taken. The other statements in the question, such as the port being disabled or having the maximum number of supported MAC addresses, do not have enough evidence to be concluded.

The correct answer is "Une version complète du logiciel Cisco IOS a été trouvée et chargée" and "Un test POST (Power-On Self Test) s'est déroulé normalement." This can be concluded because the prompt "Switch>" indicates that the switch has successfully booted up and is ready for user input. The presence of the complete Cisco IOS software and the successful completion of the POST indicate that the switch is functioning properly.

The correct answer is executing the interface shutdown and no shutdown commands. These commands will disable and then enable the interface, allowing it to return to an operational state. This process can help troubleshoot and resolve any errors or issues with the switch port. Switchport mode access, removing and reconfiguring port security, and clearing the MAC address table do not directly address the issue of returning the switch port to an operational state.

When the sticky MAC address learning is enabled with the "switchport port-security mac-address sticky" command, the dynamically learned MAC addresses are stored in the volatile memory (RAM) of the switch. This allows the switch to retain the MAC addresses even after a reboot or power cycle. The RAM is a type of memory that provides fast and temporary storage for data and instructions that are actively being used by the switch.

The partial result of the "show interfaces fastEthernet 0/0" command indicates that there may be an issue with the network card. This issue could cause the transmission of frames that exceed the allowed length.

The command "show interface" reveals that there may be too many electrical interferences and noise on the connected link.

A technician uses the "show interfaces" command when packets are received from a specific host that is directly connected. This command allows the technician to view the status and statistics of the interfaces on the network device, including information about the packets received and transmitted. By analyzing the output of this command, the technician can troubleshoot any issues related to the connectivity between the host and the network device.

The first statement is true because if a number lower than the maximum number of MAC addresses for a port is statically configured, dynamically acquired addresses are added to the associative memory until the maximum number is reached. The second statement is also true because secure MAC addresses acquired dynamically are lost upon switch restart.

The given correct answers are "Le Fast Ethernet bidirectionnel simultané offre une efficacité de 100 % dans les deux directions" (Simultaneous bidirectional Fast Ethernet offers 100% efficiency in both directions) and "Le flux de données bidirectionnel améliore les performances" (Bidirectional data flow improves performance). These statements indicate that simultaneous bidirectional Fast Ethernet provides optimal efficiency in transmitting data in both directions and that bidirectional data flow enhances overall performance.