Which of the following protocols typically listens on TCP port 389? (Select the best answer.)
A.
LDAP
B.
SCCP
C.
SIP
D.
XMPP
Explanation:
Lightweight Directory Access Protocol (LDAP) listens on Transmission Control Protocol (TCP) port 389
unencrypted. LDAP Secure (LDAPS) listens on TCP port 636 over Secure Sockets Layer (SSL). LDAP is a
directory protocol that is used by other servers, such as Cisco Unified Presence (CUPS) to perform contact
lookups.
Session Initiation Protocol (SIP) is an Internet Engineering Task Force (IETF)standard call signaling protocol.
Although SIP is typically used as a peertopeer call signaling protocol, it can also operate in client/ server mode.
SIP is used for call signaling between Cisco Unified Communications Manager (UCM) and thirdparty IP phones,
or between UCM and Cisco SIPenabled IP phones. SIP is supported on Cisco IP phones with a firmware
replacement.
Skinny Client Control Protocol (SCCP) is a Ciscoproprietary, client/server call signaling protocol. SCCP must be
used with a Cisco call processing platform, such as UCM, because SCCP is proprietary to Cisco. The firmwareon Cisco IP phones is configured to use SCCP by default. SCCP must be used on Cisco IP phones to enable
the phones to use Cisco’s full Voice over IP (VoIP) feature set.
Extensible Messaging and Presence Protocol (XMPP) is an open Extensible Markup Language (XML) instant
messaging (IM) and presence protocol. CUPS uses XMPP to communicate with thirdparty IM clientshttps://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/10_0_1/
CUP0_BK_C318987B_00_config-admin-guide-imp-100/CUP0_BK_C318987B_00_config-admin-solutions-imp-
100_chapter_0110.html#CUP0_RF_L39030A6_00