Table of Contents
- 1 Why is it good practice to block unused outgoing ports?
- 2 How do I disable unused ports on a Cisco switch?
- 3 How do I secure unused interfaces?
- 4 What is considered best practice for dealing with unused ports?
- 5 How do you reset a port on a switch?
- 6 What is no shutdown command?
- 7 What are at least two best practices that should be implemented for unused ports on a Layer 2 switch for switch security?
- 8 Which ports should I disable?
- 9 Why do I need to disable ports on my Network?
- 10 Why are unused ports assigned to junk VLANs?
Why is it good practice to block unused outgoing ports?
The idea is that if you block access to additional ports beyond what you’re already expected, then it’s more difficult for an attacker to leverage an initial compromise to gain more complete access to the server (e.g. by binding a remote shell to an additional port).
How do I disable unused ports on a Cisco switch?
Disable Unused Ports Navigate to each unused port and issue the Cisco IOS shutdown command. If a port later on needs to be reactivated, it can be enabled with the no shutdown command.
How do I disable a port on a switch?
To disable a port: Locate the port(s), click Disable….Enable/disable switch ports procedure
- In the main menu of the web administration interface under Miscellaneous, click the Enable/Disable Ethernet Switch Ports link.
- The Enable/Disable Ethernet Switch Ports screen appears, showing either:
How do I secure unused interfaces?
Securing Unused Interfaces
- Configure the privileged EXEC password.
- Configure the maximum number of MAC addresses.
- Configure the port to add the MAC address to the running configuration.
- Secure Unused Ports.
- Step 2: Disable interfaces Fa0/1 to Fa0/24 on SW1.
What is considered best practice for dealing with unused ports?
A simple method that many administrators use to help secure the network from unauthorized access is to disable all unused ports on a switch. For example, if a Catalyst 2960 switch has 24 ports and there are three Fast Ethernet connections in use, it is good practice to disable the 21 unused ports.
Should you block outbound ports?
In general, policies are created to block traffic that uses protocols and destination ports that are unnecessary or often abused. For example, the SANS Institute recommends blocking outbound traffic that uses the following ports: MS RPC – TCP & UDP port 135. NetBIOS/IP – TCP & UDP ports 137-139.
How do you reset a port on a switch?
Reset Cisco switch port/interface to default then apply vlan
- Switch> en.
- Switch# conf t.
- Switch(config)# default interface Gi1/0/1.
- Switch(config)# exit.
What is no shutdown command?
The no shutdown command enables an interface (brings it up). This command must be used in interface configuration mode. It is useful for new interfaces and for troubleshooting. When you’re having trouble with an interface, you may want to try a shut and no shut.
What is the status of the port speed LED If the LED light is green?
When selected, the port LEDs will display colors with different meanings. If the LED is off, there is no link, or the port was administratively shut down. If the LED is green, a link is present. If the LED is blinking green, there is activity and the port is sending or receiving data.
What are at least two best practices that should be implemented for unused ports on a Layer 2 switch for switch security?
Layer 2 Security Best Practices
- Manage the switches in a secure manner.
- Restrict management access to the switch so that untrusted networks are not able to exploit management interfaces and protocols such as SNMP.
- Always use a dedicated VLAN ID for all trunk ports.
- Be skeptical; avoid using VLAN 1 for anything.
Which ports should I disable?
For example, the SANS Institute recommends blocking outbound traffic that uses the following ports:
- MS RPC – TCP & UDP port 135.
- NetBIOS/IP – TCP & UDP ports 137-139.
- SMB/IP – TCP port 445.
- Trivial File Transfer Protocol (TFTP) – UDP port 69.
- Syslog – UDP port 514.
What does it mean to have unused access ports?
Access Port are the frames received on the interface are assumed to not have a VLAN tag and are assigned to the specified VLAN. Internal security policies may mandate that an unused port must be protected by several layers to disallow access to the network. (i.e, shutdown the ports)
Why do I need to disable ports on my Network?
If you have those monitoring systems in place, then why bother disabling ports, you’re going to be notified if something new pops up on your network. You’re just creating more work for yourself. Using another method of authenticating clients to your network like 802.1x is going to be a far better way to protect your network.
Why are unused ports assigned to junk VLANs?
It’s worth noting that in my CCNP training I was taught that unused ports (especially those patched to the wall) should be assigned to a junk VLAN, and disabled. This keeps you from enabling a port on the wrong VLAN and giving someone incorrect access as you have to set the VLAN every time you enable a port. Was this post helpful?
Can You disable the switch ports on a Mac?
We do not disable our switch ports at all. Everything is MAC filtered on our network so you cant just plug in and get an address. Any vendors etc. we force to use WIFI which is not connected to our domain. Was this post helpful?