In terms of remote office design, which one of these statements is a characteristics only of a small remote office (up to 50 user), and not of medium or remote offices?
A.
I ink redundancy to access layer switches is not possible with an integrated design.
B.
A collapsed access and distribution layer is required.
C.
There are no loops in the network design.
D.
Layer 3 services such as DHCP, firewall, and NAT are provided by enterprise campus.
Explanation:
Answer A is incorrect as EtherChannel connectivity to the ISR Router is an option for this design. EtherChannel (Link Aggregation) is built on link redundancy Answer C is incorrect as there can be loops contained within the design but they will be blocked by default with Rapid PVST+
Answer D is incorrect as DHCP, firewall, and NAT are supported in the small officeSmall Branch Design
The small branch design is recommended for branch offices that do not require hardware redundancy and that have a small user base supporting up to 50 users. This profile consists of an access router providing WAN services and connections for the LAN services. The access router can connect the Layer 2 switch ports in one of three ways:Integrated Layer 2 switching using an optional EtherSwitch module that provides 16 to 48 Ethernet ports for client connections. Some modules support PoE.
External Layer 2 switching using a trunk connection to an access switch that aggregates the Ethernet connections. The access switch can also include PoE to support IP phones and wireless APs.
Logical EtherChannel interface between the ISR and the access switches using the EtherSwitch module. The access switches can also provide PoE as needed.
The Layer 3 WAN services are based on the WAN and Internet deployment model. A T1 is used for the primary link, and an ADSL secondary link is used for backup. Other network fundamentals are supported, such as EIGRP, floating static routes, and QoS for bandwidth protection.
The ISR can support the default gateway function and other Layer 3 services such as DHCP, NAT, IPsec VPN, and IOS Firewall.
Layer 2 services can be provided by the Cisco ISR using switch modules or the Cisco Catalyst 2960, 3560 or 3750 series-based access switches. It is recommended that you use Rapid Per VLAN Spanning Tree Plus (PVST+) for all Layer 2 branch offices where loops are present. Rapid PVST+ ensures a loop-free topology when multiple Layer 2 connections are used for redundancy purposes.
Both the Cisco 2921 and the 2951 ISRs support three integrated 10/100/1000 Ethernet interfaces, which support Layer 3 routing, and one slot for a network
I think the answer is C
The VCE dumps are correct. The answer is ‘C’
From: Designing for Cisco Internetwork Solutions (DESGN) Foundation Learning Guide
Chapter 5: Designing Remote Connectivity 254/5
Small Branch Office Design
To keep manageability simple, there are no loops in the topology.
Note Although there are no Layer 2 loops in the planned design, spanning tree must be enabled and configured to protect the network from any accidental loops.
Both B and C can be correct, but in case of B, there could be accidental loop.
So I guess, if one choice is to be made, C would be most appropriate.
A collapsed access and distribution layer is required.
“It’s optional, not required.”
i think the key word “required” showed B it’s flaw. C should be the answer
well, i thought it was C based on what Trying_to_pass wrote; however, I just read this:
“There is no Layer 2 switch on the edge router, and there are also no loops in the topology. With this topology, there is no need to configure a Layer 2 topology. By default, spanning tree is enabled on all access switches, but there is no spanning tree configuration involved. ”
under Medium Office design here:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Branch/Design.html#wp66207
so, to me, that also rules out C and takes me ‘back to B’ – where typically it is ‘just an ISR and a switch’ (meaning while it’s not ‘required’ per se, it is, basically THE design (therefore) required).
ugh.
…also, from what I think I read in the Office Cert Guide, a collapsed Distribution and Core are optional (not collapsed Access/Distribution)…
So I vote B.
C is correct.
B is nonsense. A collapsed “Access and Distribution” does not exist. That would be a collapsed CORE, which is totally different.
Victor MORENO (CCIE) about “collapsed access and distribution layers”:
In a network where the distribution and access are collapsed, the distribution switches also act as access switches (as shown in Figure 2-3). Collapsing network layers in this manner limits the port densities that can be handled by the network and thus its scalability. Therefore, this solution is normally chosen for networks of limited size that expect little growth.
I think C is correct.
https://www.cisco.com/application/pdf/en/us/guest/netsol/ns551/c649/ccmigration_09186a00806fe245.pdf page 9
To keep the manageability simple, there are no loops in the topology. In option (2) for small office design, where the network module-based Ethernet switch is used, redundancy can be provided by EtherChannels.
Chapter 7 WAN Design, Small Branch Design, Page 250 of the Official CCDA Cert Guide (September 2013 Version)
“It is recommended that you use Rapid Per VLAN Spanning Truee Plus (PVST+) for all Layer 2 branch offices where loops are present. Rapid PVST+ ensures a loop-free topology when multiple Layer 2 connections are used for redundancy purposes.”
Based on that it seems like Cisco does anticipate loops. Pretty sure B is correct.
Then again you wouldn’t intentionally put a loop in the network design… so maybe it is C… this is a terrible question.