Users can log in to an FTP server behind the firewall, but directory listings and file transfers hang. The firewall allows only TCP 21. What is the likely cause?
Les utilisateurs peuvent s'authentifier sur un serveur FTP placé derrière le pare-feu, mais les listes de répertoires et les transferts de fichiers restent bloqués. Le pare-feu n'autorise que TCP 21. Quelle est la cause probable ?
Answers
AThe login succeeds but the password is checked again too slowlyL'authentification réussit, mais le mot de passe est revérifié trop lentement
BThe server needs port 21 changed to 22 before transfers can workLe serveur doit passer du port 21 au port 22 pour que les transferts fonctionnent
CThe separate data connections use ports the firewall does not allowLes connexions de données séparées utilisent des ports que le pare-feu n'autorise pas
DWindows servers are unable to send folder listings to FTP clients at allLes serveurs Windows ne peuvent pas du tout envoyer de listes de dossiers aux clients FTP
The answer and explanation are in the full bank.
This question is one of 2,831 in the paid banks. Each comes with the correct answer and the reasoning behind it, not just a mark.
Unlock for 5,000 RWFMIFOTRA exam practicealigned to Practice set: Ports and Protocols·3 marks·Hard
More Networking questions
- A wireless mesh network spans a large warehouse. If one access point fails, data is automatically rerouted through another path. This self-healing nature is characteristic of what topology?
- You are tasked with connecting two office buildings across a city spanning 15 miles. Which network type best fits this deployment?
- A hospital requires dedicated high-speed fiber channels to connect its database servers directly to storage arrays. What network type is being utilized?
- An employee pairs their Bluetooth headphones to their smartphone. What type of network does this pairing establish?
- A university interconnects multiple LANs across its academic buildings using a unified administration domain. This best describes a...
- Your company leases a dedicated MPLS circuit from an ISP to connect headquarters in New York to a branch in Tokyo. What network type is this?
- A system administrator needs to allocate IP addresses for a subnet that requires 14 hosts. Which CIDR notation provides exactly enough addresses without excessive waste?
- An engineer configures a branch router with IP 10.10.10.130/26. What is the broadcast address for this specific subnet?