Question 1

What are the key differences between Cisco 1900, 2900, and 3900 Series routers?

Accepted Answer

The Cisco 1900 Series delivers up to 85 Mbps throughput for small offices, the 2900 Series offers up to 170 Mbps for mid-size sites, and the 3900 Series scales to 300 Mbps+ for enterprise branch deployments with higher port density and modularity.

Question 2

Which Cisco router series is best for small to medium businesses?

Accepted Answer

For small businesses, the Cisco 1900 Series provides cost-effective WAN connectivity, while the 2900 Series balances performance and features for growing mid-size deployments.

Question 3

What throughput can I expect from the Cisco 1900, 2900, and 3900 routers?

Accepted Answer

Cisco 1900 routers deliver up to 85 Mbps, 2900 routers up to 170 Mbps, and 3900 routers exceed 300 Mbps of aggregate throughput with appropriate IOS feature licenses.

Question 4

How many network interfaces do Cisco 1900, 2900, and 3900 Series routers support?

Accepted Answer

The 1900 Series supports up to four integrated Gigabit Ethernet ports, the 2900 Series up to eight, and the 3900 Series up to ten fixed ports plus multiple modular slots for expansion.

Question 5

Can I upgrade memory and flash on Cisco 1900, 2900, and 3900 routers?

Accepted Answer

Yes, all three series support field-replaceable DRAM and flash modules to increase performance and storage for larger IOS images and feature sets.

Question 6

What security features are available on the Cisco 1900, 2900, and 3900 routers?

Accepted Answer

All series include integrated firewall, VPN (IPsec, SSL), intrusion prevention (IPS), and advanced malware protection via modular IOS Security licenses.

Question 7

Do Cisco 1900, 2900, and 3900 Series routers support voice and video services?

Accepted Answer

Yes, they offer unified communications modules, embedded SBC, QoS features, and DSP slots to enable voice, video, and conferencing at the branch.

Question 8

How does the licensing model work for Cisco 1900, 2900, and 3900 routers?

Accepted Answer

Cisco uses a tiered IOS license model—IP Base, Security, UC, and Application Hosting—allowing you to activate features on demand via Smart Licensing.

Question 9

What modular expansion options exist for Cisco 1900, 2900, and 3900 routers?

Accepted Answer

All series support WAN interface cards (T1/E1, Serial, DSL, 4G LTE), LAN modules (PoE, copper, fiber), and specialized voice/video DSP modules.

Question 10

Which operating system runs on Cisco 1900, 2900, and 3900 routers?

Accepted Answer

They run Cisco IOS Software with unified configuration, supporting Cisco Configuration Professional for simplified GUI-based management.

Question 11

Can I deploy PoE on Cisco 1900, 2900, and 3900 Series routers?

Accepted Answer

Yes, select LAN modules provide 802.3af/at Power over Ethernet to power IP phones, access points, and cameras directly from the router.

Question 12

What is the end-of-life (EoL) and end-of-support (EoS) status for the 1900, 2900, and 3900 Series routers?

Accepted Answer

Cisco publishes EoL/EoS dates on its website; generally, 1900 Series is in mature end-of-support, 2900 Series follows soon, while 3900 remains fully supported for enterprise branches.

Question 13

How do I choose between Cisco 1900, 2900, and 3900 routers for specific use cases?

Accepted Answer

Select the 1900 Series for basic WAN/Internet at small sites, 2900 Series for integrated security and UC at mid-size branches, and 3900 Series for high-capacity, modular enterprise deployments.

Question 14

Do Cisco 1900, 2900, and 3900 routers support high availability?

Accepted Answer

The 3900 Series supports dual power supplies and performance redundancy features, while 1900/2900 Series offer performance tuning and QoS but lack full hardware failover.

Question 15

What are the power consumption and cooling requirements for Cisco 1900, 2900, and 3900 routers?

Accepted Answer

Power draw ranges from 40–90 W for 1900 Series, 60–150 W for 2900 Series, and up to 300 W for 3900 Series; all require front-to-back airflow in standard rack environments.

Question 16

What software features enhance performance on Cisco 1900, 2900, and 3900 routers?

Accepted Answer

Features include Performance on Demand for dynamic crypto acceleration, Application Visibility and Control, AVC, mLTE, and Embedded Event Manager for automation.

Routers 1900 2900 3900 Series

Sub Categories of 1900 2900 3900 Router

1900 & 2900 & 3900 Series Router Flash Memory (14)

1900 Router Memory & Flash (8)

2900 Router Memory & Flash (12)

3900 Router Memory & Flash (5)

MEM-2900-2GB= (2GB DRAM (1 DIMM) for Cisco 2901, 2911, 2921 ISR, Spare)

MEM-CF-256MB= (256MB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR)

MEM-2900-512MB= (512MB DRAM (1 DIMM) for Cisco 2901, 2911, 2921 ISR, Spare)

MEM-CF-256MB (Cisco Memory MEM-CF-256MB)

MEM-1900-512U2.5GB (UPG 512MB TO 2.5GB DRAM 2GB+512MB FOR CISCO 1941 ISR)

MEM-2900-512U1GB (UPG 1GB KIT 2X512MB FROM 512MB DRAM FOR CISCO 2901-2921)

MEM-1900-1GB= (1GB DRAM 1 DIMM FOR CISCO 1941/ 1941W ISR SPARE)

MEM-2951-512MB= (512MB DRAM 1 DIMM FOR CISCO 2951 ISR SPARE)

MEM-2900-1GB= (1 GB DRAM (1 DIMM) for Cisco 2901, 2911, 2921 ISR, Spare)

MEM-3900-512MB= (512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE)

MEM-1900-512MB (Cisco Memory MEM-1900-512MB)

MEM-1900-512U1.5GB (UPG 1.5GB FROM 512MB DRAM FOR CISCO1941 ISR)

MEM-1900-512U1GB (UPG 512MB TO 1GB DRAM 512MB+512MB FOR CISCO 1941 ISR)

MEM-2951-512U1GB (512MB to 1GB DRAM Upgrade (1 1GB DIMM) for Cisco 2951 ISR)

MEM-CF-512MB= (512MB Compact Flash for Cisco 1900, 2900, 3900 ISR)

MEM-1900-2GB= (2GB DRAM 1 DIMM FOR CISCO 1941/ 1941W ISR SPARE)

MEM-3900-1GB= (1GB DRAM (1 DIMM) for Cisco 3925/3945 ISR, Spare)

MEM-CF-256U1GB (Cisco Memory MEM-CF-256U1GB)

MEM-1900-1GB (Cisco Memory MEM-1900-1GB)

MEM-2951-512U1.5GB (UPG 1.5GB FROM 512MB DRAM 1GB+512MB FOR 2951 ISR)

Questions & Answers