Enterprise Network Design Flashcards
Campus Networks
Client to server traffic. Also known as North-South traffic
Data Center Networks
Server to server traffic. Also known as East-West traffic
Equal-cost multipath routing (ECMP)
Can simultaneously use multiple equal paths between servers to increase available bandwidth.
Leaf and Spine Architecture
Provides a predictable number of hops between any 2 servers
Leaf switches connect to spine switches
Nodes have multiple connections to leaf switches
Core Layer
Center of campus. Connections should always be routed.
Access Distribution Block
Distribution/Aggregation and Access layers combined.
Distribution or Aggregation Layer
Reliable and consistent connection to the core while conserving port space on the core switches
Two-Tier Collapsed Core
Combines the core and distribution layers
Looped Topologie (Looped Triangle)
Physical loops and STP prevents bridging loops from occurring
Looped Square Topology
Consumes fewer ports on the distribution switches. Each access switch connects to only one distribution switch and one access switch
Looped Free Topology
No physical loops in the access and distribution layers
Looped Free U Topology
Lets you span a VLAN between 2 access switches
VSS
Loop free, 2 switches connected via VSL
Stateful Switchover
Allows a hot standby to take control of a failed route processor
Syncs FIB and CEF adjacencies between active and standby switches. No need for FHRP. Uses NSF to continue without interruption.
Routed Access Topology
VLAN cant span more than one access switch. Each access switch must serve as DG for its respective VLAN.
Port Aggregation Protocol (PAgP)
Cisco Proprietary Modes are Desirable and Auto Auto-Auto will not form an EtherChannel Auto-On will not form an EtherChannel Desirable-On will not form an EtherChannel
Link-Aggregation Control Protocol (LACP)
Open Standard Modes are Active and Passive Passive-Passive will not form an EtherChannel Passive-On will not form an EtherChannel Active-On will not form an EtherChannel
HSRP
Cisco Proprietary Preempt not enabled by default Only version 2 supports ipv6 0000.0C07.acxx where xx is group number in hex Multicast address 224.0.0.2
VRRP
Open Standard
Preempt enabled by default
Can use interface IP as virtual IP. Priority will automatically be set to 255 if using the interface IP
0000.5e00.01xx where xx is group number in hex
Multicast address 224.0.0.18
GLBP
Cisco Proprietary
Can load balance traffic
One router as AVG and al others as AVF
An AVG can be an AVF
0007.b400.xxyy, where xx is group number and yy, is the forwarder number
Load-balancing methods are round-robin, weighted, and host-dependent
Multicast address 224.0.0.12
