Arista

Question 1

EOS

Answer 1

Extensible Operating System.
Linux user space processes called “agents”.
All agents interact via registration with “sysdb” database.
Much better than RPC.
A kind of enhanced shared memory.

Question 2

Sysdb

Answer 2

Agents register to subset or whole.

Agents get state updates on registered subset.

Question 3

Agent

Answer 3

Has a notification polling thread.

Treat like an ISR - no blocking calls, just update local state and return to polling.

Question 4

Spanning Tree

Answer 4

Undirected graph.
Is a tree.
Includes all vertices of the space with minimum edges.
All nodes reached with minimum travel distance.

Question 5

STP

Answer 5

Spanning Tree Protocol.
Creates Spanning Tree within network of layer 2 bridges.
Leaves “single” active path btwn any 2 nodes.

Question 6

Network Bridge

Answer 6

Connects separate networks as if they were one.

Question 7

OSI Layer 1

Answer 7

physical (pin layour, voltage, impedence etc..

Question 8

OSI Layer 2

Answer 8

Datalink (error correction,nodenode data transfer,defines how to connect, flow control

Question 9

OSI Layer 3

Answer 9

Network (many interconnected nodes,addressed nodes,sending datagrams,API=data payload,address)

Question 10

OSI Layer 4

Answer 10

Transport (TCP, UDP)

Question 11

OSI Layer 5

Answer 11

Session

Question 12

OSI Layer 6

Answer 12

Presentation (abstract network for Application layer)

Question 13

OSI Layer 7

Answer 13

Application