Network Engineering

Disadvantages of using Layer 3 switch as a router Doesn’t support MPLS and VPN services Doesn’t support NAT, firewalling, tunnel, IPSec Size of routing table is small Forwarding is performed by ASIC No QOS support Advantages of using routers Non-Ethernet connections (which still do exist) Large routing tables Many routing VRFs — campus and datacenter switches don’t need ‘em, at least for common uses NAT, especially with protocol fixups (address in payload situations) Large ACLs without loss of efficiency QoS not tied to 4 or 8 hardware queues (i.

Index, Shards and Replicas An index is automatically created when a document is inserted into the Elastic search. we can define the number shards, while creating the index or it will take default 5 shards It means elastic search will create 5 primary shards that will contain our data Every time we index a document, elasticsearch will decide which primary shard is supposed to hold that document and will index it there.