Exam N10-008 topic 1 question 202 discussion

The real question is: Why in the world would anyone use telnet? XD

The most likely cause for the failure is that the switch is not listening on the default telnet port (TCP port 23). Therefore, the correct option is A. The network engineer is using the wrong protocol. To verify this, the engineer should check the switch configuration to see if the telnet service is enabled and if it is using a different port. The engineer should also ensure that the telnet client is configured to use the correct port if it is not using the default port.

Based on the error message provided ("Could not open connection to the host, on port 23: Connect failed"), the most likely cause for the failure to connect to the switch using telnet is: **D. The switchport the engineer is trying to configure is down.** This is the most likely cause because the error message indicates that the connection attempt failed, which suggests that there is no active network connection on the switchport being used for the telnet connection. If the switchport is down (administratively disabled or physically disconnected), the telnet connection attempt would indeed fail. While option A ("The network engineer is using the wrong protocol") is a possibility, it is less likely based on the specific error message provided. If the engineer were using the wrong protocol, the connection might still be established, but the communication would fail due to the protocol mismatch.

A port in networking is a software-defined number associated to a network protocol that receives or transmits communication for a specific service. A port in computer hardware is a jack or socket that peripheral hardware plugs into. ACL would hopefully inform you that connection is blocked which is also included with permission denial. The port would tell you if connection is down.

ACL block ports though

This should be worded, A he's using an unopen port which is telnet unsecure.

A. Syslog server messages would provide the most detailed data in an investigation to determine how the firewall was compromised. Syslog is a standard protocol used to send system log or event messages to a specific server, allowing administrators to centralize and monitor log data. In this scenario, the syslog server would have recorded all firewall configuration and activity data prior to the network outage caused by the attack. The MIB of the firewall, network baseline reports, and NetFlow aggregate data could also provide valuable information, but are less likely to be as detailed as the syslog data.

I believe the correct answer is A, and here is my reasoning. Answer B is incorrect because you have not begun to configure the device. You have to connect to it first before you can configure it. Answer C has nothing to do with the question in hand. Answer D is incorrect because the network engineer is connecting to the switch itself, not the interface he is trying to configure. He is most likely SSHing into the switch over the network, or he is using a serial console cable to connect to the DB-9/DB-25/rollover management interface on the switch. Either way, the interface he wants to configure being down has nothing to do with his initial connection into the switch.

Without additional context or information about the scenario, it is difficult to determine the most likely cause for option 4. However, based on the options given, option A is the most likely cause since using the wrong protocol can result in the inability to properly configure the device. It could also result in errors or unexpected behavior when attempting to configure the device. Nonetheless, more information would be needed to make a definitive determination. ChatGPT

I thought long and hard about this stupid question. Here's the deal: The switchport being down seems dumb because if he's Telnetting into the switch and getting this error, he hasn't even begun to do any work on the switchport he wants to configure. If he's at the device, why is he Telnetting in? Use a console cable. I think it's just that he's using Telnet when he should be using SSH. So in that respect he's using the wrong one. He should know better, he's an engineer. And it's bad practice to plug into a switchport other than the console to be doing administrative work.

The most likely cause for the failure is that the network engineer is using the wrong protocol. Telnet uses TCP port 23 for remote access to a switch, but if the switch is configured differently, the connection may not be established. In this case, it is possible that the switch is not configured to allow Telnet connections, or it may be configured to use a different protocol such as SSH, which uses TCP port 22.

A. It's not "wrong". You can use it to configure a sw. It's not secure but you can. B. not even got to that point C. nothing to do with SNMP D. The switchport the engineer is trying to configure is down.

If a switchport is down, you will likely receive a message indicating that the connection has been refused or that the host is unreachable. This could be due to the port being administratively down, or there may be a physical issue with the port or cable. To troubleshoot this issue, you can check the switch's interface status and configuration, and ensure that the cable is properly connected.

If the telnet service is not running on a device that you are trying to connect to, you would get the message in the question. It could also be an ACL, but choice C says SNMP, which makes it incorrect. Choice B isn't good either because the question doesn't mention the engineer putting in credentials to telnet. Choice D is possible if it is a Layer 3 switch and the port is not in switchport mode and has an IP address assigned to it, but choice A is MOST likely than D.

telnet port is 23 , but connection failed . So maybe should use SSH protocol That's what I think

I believe it's A because many securely configured firewalls block Telnet because of the protocol's unsecurity; therefore, it's the wrong protocol. SSH (port 22) would be the correct one. B seems specious because permission to CONFIGURE a device shouldn't preclude the engineer from CONNECTING to it. I'm no expert, however (hence I'm cross-checking these questions), so I'd appreciate further insight.

From what I researched is seems to be a firewall rule which would make it B...