Architecture I Flashcards
What are some disadvantages of a flat design?
Single Broadcast domain (Too many network devices share a single broadcast OR collision domain). High Cost. More broadcast traffic, increase of bandwidth and CPU to process broadcast traffic. Manageability.
Benefits of Cisco Three-Tier Enterprise Campus Architecture
Switches and Routers segment network devices, segment collision and broadcast domains. Dividing the network design into layers simplifies scalability and troubleshooting. Reduces management complexity with a layered design.
What are the three layers in an enterprise campus design?
Access, Distribution and Core Layer
What takes place at the access layer?
User authentication, QoS classification and marking, port-security, NAC, PoE. VLANs are implemented to provide network segmentation.
What takes place at the Distribution Layer?
Also called aggregation layer. ACL’s take place here. Provides layer 3 uplinks to the Core. QoS resource reservation, interVLAN routing, packet manipulation, route filtering and summarization. IPS. DG for access layer devices resides in the distribution layer. FHRP’s may be necessary, especially if one DG goes down for on the switches.
What happens at the Core Layer?
Fastest switching path in the network. Very little packet manipulation and route processing should occur here - that is done in the distribution layer. Highly scalable, requires minimal connectivity to Dist switches. Distribution switches do not need to be interconnected, they can rely on the am redundancy of the Core layer.
Explain Cisco Two-Tier Enterprise Campus Architecture
Also called the collapsed Core, functionality of the Core is collapsed into the distribution layer.
What are the four modules in a Cisco Enterprise Architecture model?
Remote Location, Enterprise Campus (datacenter), Enterprise Edge and Service Provider Edge
What submodules are provided in the datacenter?
DHCP, network services such as application, email, Domain Name System and file services
Explain enterprise edge MODULE
Consists of the Internet Edge and WAN Edge submodules. These submodules provide connectivity between the internal network and service provider infrastructure
What are the submodules for the Service Provider Edge
Provides connectivity between enterprise location and remote locations. Connectivity provided by an internet, MPLS, Metro Ethernet or another WAN provider.
What are the three FHRPs?
HSRP, GLBP, and VRRP (non-cisco proprietary)
What is the difference between a switched Access Layer Design and a Routed Access Layer Design
End devices can use a directly connected layer 3 switch as a DG, and the Layer 3 switch can use dynamic routing protocols, such as EIGRP. Don’t have to worry about Layer 2 loops - in a access layered design, if access to a dg is disrupted, those end devices will lose connectivity outside of their own VLAN.
