Which statement accurately describes one difference between a small office and medium office topology?

A.
Medium offices commonly use integrated route and switching platforms.

B.
Medium offices use integrated 10/100/1000 interfaces as Layer 2 trunks.

C.
Medium offices use external access switches to support LAN connectivity.

D.
Small offices commonly use Rapid PVST+ for Layer 3 deployments.

Explanation:

Medium Branch Design
The medium branch design is recommended for branch offices of 50 to 100 users, which is similar

to the small branch but with an additional access router in the WAN edge (slightly larger) allowing for redundancy services. Typically, two 2921 or 2951 routers are used to support the WAN, and separate access switches are used to provide LAN connectivity.

The infrastructure components are dual-access routers, external Layer 2 / Layer 3 switches, laptops, desktops, printers, and IP phones. Dual Frame Relay links provide the private WAN services, which are used to connect back to the corporate offices via both of the access routers. Layer 3 protocols such as EIGRP are typically deployed. Because there are two routers, Hot Standby Router Protocol (HSRP) or Gateway Load Balancing Protocol (GLBP) can be used to provide redundancy gateway services. QoS can also be used to provide guaranteed bandwidth for VoIP, and policing can be used to restrict certain traffic classes from overwhelming the available bandwidth. Cisco IOS features such as QoS, access control lists (ACL), and RIP routing capabilities are available in the IP Base feature set, but IP unicast routing and multicast routing require the IP Services feature set.

The medium branch design supports using a higher-density external switch or using the EtherSwitch module with the ISR to create trunks to the external access switches. The Cisco Catalyst 3750 series switches have StackWise technology, allowing multiple switches to be connected and managed as one. This also increases the port density available for end-user connections. With Cisco StackWise technology, customers can create a single, 32-Gbps switching unit that can connect up to nine 3750 series switches using a variety of fiber and copper ports, allowing greater flexibility with the connection options.

Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 7