Question 1

What is the Cisco Catalyst 3850 Network Module?

Accepted Answer

The Cisco Catalyst 3850 Network Module is a hot-swappable uplink expansion module that enhances 3850 Series switches with flexible port configurations, high-speed connectivity, and advanced Layer 2/3 features.

Question 2

Which uplink network modules are compatible with the Cisco Catalyst 3850?

Accepted Answer

Cisco Catalyst 3850 supports modular uplinks including C3850-NM-2-10G, C3850-NM-4-10G, C3850-NM-2-M, and C3850-NM-4-M for 1G, 10G, and multi-rate SFP/SFP+ connectivity.

Question 3

How do I install a network module on the Cisco Catalyst 3850 switch?

Accepted Answer

To install, power down the switch, align the network module with the rear slot, slide it in until the latch engages, secure the captive screws, then power up the switch and verify module status with the CLI.

Question 4

Can I hot-swap the network module on a Cisco Catalyst 3850?

Accepted Answer

Yes, Cisco Catalyst 3850 network modules are hot-swappable, allowing insertion or removal without powering down the switch, provided you have redundant power supplies and non-disruptive IOS-XE software.

Question 5

How many network module slots does the Cisco Catalyst 3850 have?

Accepted Answer

Each Cisco Catalyst 3850 switch features two rear-accessible network module slots, enabling simultaneous use of up to two different uplink modules for maximum flexibility.

Question 6

What port speeds are supported by Catalyst 3850 network modules?

Accepted Answer

Supported port speeds include 1G (SFP), 10G (SFP+), and multi-rate options (1/10G), depending on the network module model installed.

Question 7

Which optical transceivers work with the Cisco Catalyst 3850 Network Module?

Accepted Answer

Cisco-qualified SFP and SFP+ optics such as GLC-SX-Mini, GLC-LX-SMD, and SFP-10G-SR are fully compatible; always use Cisco-branded transceivers to ensure optimal performance.

Question 8

What is the typical power consumption of a Catalyst 3850 network module?

Accepted Answer

Typical power consumption ranges from 3W for 1G modules up to 8W for 10G modules; refer to the module’s data sheet for exact measurements under full load.

Question 9

Do I need an additional license for Cisco Catalyst 3850 network modules?

Accepted Answer

No separate license is required; the network module functionality is included in the base Cisco IOS-XE image, though advanced features may require the LAN Base, IP Base, or IP Services license.

Question 10

How do I configure VLANs on Catalyst 3850 network module ports?

Accepted Answer

Use standard IOS-XE commands under interface configuration mode, for example:
interface TenGigabitEthernet1/1/1
 switchport mode access
 switchport access vlan 10
 exit

Question 11

Can I stack Cisco Catalyst 3850 switches with different network modules?

Accepted Answer

Yes, Catalyst 3850 supports StackWise-480 technology and automatically negotiates uplink compatibility across mixed network module deployments.

Question 12

Which CLI commands help manage Catalyst 3850 network module interfaces?

Accepted Answer

Key commands include show module, show interfaces status, show inventory, and show interface TenGigabitEthernet1/x/x to monitor module health and port statistics.

Question 13

How do I upgrade the firmware of a Cisco Catalyst 3850 network module?

Accepted Answer

Update the switch’s Cisco IOS-XE image using the archive download or software install commands; the network module firmware is automatically upgraded during the IOS-XE upgrade process.

Question 14

Are Cisco Catalyst 3850 network modules covered under warranty?

Accepted Answer

Yes, all genuine Cisco Catalyst 3850 network modules carry a one-year limited hardware warranty, which can be extended with Cisco Smart Net Total Care.

Question 15

How can I troubleshoot connectivity issues on a Catalyst 3850 network module?

Accepted Answer

Verify module status with show module, check link lights, review logs via show logging, confirm transceiver compatibility, and test end-to-end reachability with ping and traceroute.

Question 16

What are the benefits of using a network module over fixed uplink ports on Cisco Catalyst 3850?

Accepted Answer

Network modules provide modular scalability, flexible port densities, future-proof uplink speeds, and simplified field replacement compared to fixed-port designs.

Network Module Cisco Catalyst 3850

C3850-NM-4-1G (CATALYST 3850 4X1GE NETWORK MODULE)

C3850-NM-4-10G (Cisco Catalyst 3850 4 x 10GE Network Module)

C3850-NM-2-10G (Cisco Catalyst 3850 2 x 10GE Network Module)

C3850-NM-8-10G (Cisco Catalyst 3850 8 x 10GE Network Module)

Questions & Answers

What is the Cisco Catalyst 3850 Network Module?

Which uplink network modules are compatible with the Cisco Catalyst 3850?

How do I install a network module on the Cisco Catalyst 3850 switch?

Can I hot-swap the network module on a Cisco Catalyst 3850?