Cisco 350-801 CLCOR study guide
Cisco 350-801 CLCOR · Work through your exam, one topic at a time.
CLCOR (350-801) is the core exam on Cisco's collaboration track. It validates the knowledge an engineer needs to implement and operate the core technologies behind an on-premises and hybrid Cisco collaboration deployment - the call-processing platform, the dial plan, the media resources and the endpoints that register to it - rather than the design or troubleshooting depth tested at the professional tier above it. The Cisco 350-801 CLCOR study guide has 5 sections and about 1,620 words.
01Infrastructure and Design
Every Cisco UCM deployment begins with exactly one publisher - the database master and the first node installed - and scales up to 20 CUCM nodes per cluster, with subscribers holding read-only replicas. Only the publisher accepts configuration changes; if it fails, existing calls and registrations on subscribers continue in reduced functionality mode, but no adds, moves, or changes are possible until it returns.
318 words, about 2 min02Protocols and Codecs
Know which device does the thinking. SCCP (Skinny) is a thin-client stimulus protocol: phones send keystrokes over TCP 2000 and CUCM keeps call state.
309 words, about 2 min03Endpoints and Endpoint Management
A Cisco IP Phone powers up via PoE, gets an address by DHCP (option 150 supplies TFTP server addresses), downloads its configuration file from TFTP, then registers - SCCP on TCP 2000, SIP on UDP/TCP 5060 - and holds that connection as a keepalive. A phone stuck at Configuring IP never got DHCP; a phone at Registering reached TFTP but was rejected or unknown to CUCM.
343 words, about 2 min04Calling and Call Control
Every dialed string is analyzed against partitions. CUCM prefers an exact match over a wildcard match, then the longest match, then the order of partitions in the calling search space; the urgent priority flag can force a pattern ahead of a longer match.
331 words, about 2 min05Media and Media Resources
An MTP terminates media streams and re-originates them - needed for DTMF mismatch, early offer where the endpoint cannot do it, SIP-to-H.323 interworking, or holding a call. A transcoder converts between codecs when regions do not overlap and lets G.729 calls reach a G.711-only conference bridge or voicemail.
319 words, about 2 min