Enterprise Network Design

Question 1

Campus Networks

Answer 1

Client to server traffic. Also known as North-South traffic

Question 2

Data Center Networks

Answer 2

Server to server traffic. Also known as East-West traffic

Question 3

Equal-cost multipath routing (ECMP)

Answer 3

Can simultaneously use multiple equal paths between servers to increase available bandwidth.

Question 4

Leaf and Spine Architecture

Answer 4

Provides a predictable number of hops between any 2 servers

Leaf switches connect to spine switches

Nodes have multiple connections to leaf switches

Question 5

Core Layer

Answer 5

Center of campus. Connections should always be routed.

Question 6

Access Distribution Block

Answer 6

Distribution/Aggregation and Access layers combined.

Question 7

Distribution or Aggregation Layer

Answer 7

Reliable and consistent connection to the core while conserving port space on the core switches

Question 8

Two-Tier Collapsed Core

Answer 8

Combines the core and distribution layers

Question 9

Looped Topologie (Looped Triangle)

Answer 9

Physical loops and STP prevents bridging loops from occurring

Question 10

Looped Square Topology

Answer 10

Consumes fewer ports on the distribution switches. Each access switch connects to only one distribution switch and one access switch

Question 11

Looped Free Topology

Answer 11

No physical loops in the access and distribution layers

Question 12

Looped Free U Topology

Answer 12

Lets you span a VLAN between 2 access switches

Question 13

VSS

Answer 13

Loop free, 2 switches connected via VSL

Question 14

Stateful Switchover

Answer 14

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.

Question 15

Routed Access Topology

Answer 15

VLAN cant span more than one access switch. Each access switch must serve as DG for its respective VLAN.

Question 16

Port Aggregation Protocol (PAgP)

Answer 16

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

Question 17

Link-Aggregation Control Protocol (LACP)

Answer 17

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

Question 18

HSRP

Answer 18

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

Question 19

VRRP

Answer 19

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

Question 20

GLBP

Answer 20

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