You can download “PPT Icons” and “Visio Stencils” of various Vendors in market from below links –

Vendor

References

Cisco
Juniper
F5
Microsoft
Azure
AWS
Google Cloud Paltform
Oracle Cloud (OCI)
A10 Networks
Huawei
Arista
HPE
Dell
Intel
Alcatel Lucent
Fujitsu
Nutanix
Lenovo
Radware
Silver-Peak
Infoblox
Forescout
Avaya
Extreme Networks
Arbor
Watchguard
FireEye
Netscout
Palo Alto
Polycom
Ruckus
Splunk
Aruba
Nutanix
VMWare
Fortinet
Citrix
Versa SD-WAN
Cradlepoint