Module 4 / Unit 1 Applications and Services Flashcards
□ Describe the functions of web application protocols and security mechanisms. □ Describe the functions of communications protocols, such as email and Unified Communications. □ Describe the basic elements of Quality of Service provision. □ Describe the functions and applications of packet shapers, load balancers, and multilayer switches.
What is SNTP?
Simple Network Time Protocol.
What must be installed on a server to use secure (HTTPS) connections?
Digital certificate.
What happens if a message sent via SMTP cannot be delivered?
The server generates a Non-Delivery Report (NDR) with an appropriate error code.
What protocol would enable a client to manage mail subfolders on a remote mail server?
Internet Message Access Protocol (IMAP). Note that Post Office Protocol (POP3) allows download of mail messages not management of the remote inbox.
What is the function of a UC gateway?
Unified Communications (UC) gateways provide interfaces between different messaging technologies, such as between VoIP and the ordinary telephone (PSTN) network.
True or false? SIP enables the location of User Agents via a specially formatted URI.
True
How is jitter mitigated by a VoIP application?
By buffering packets.
How many different traffic classes can be defined by 802.1q/p?
The field is 3-bit, allowing up to 8 values. 7 is reserved for network infrastructure (routing table updates), 6-5 for 2-way communications, 4-1 for streaming multimedia, and 0 for “ordinary” best-effort delivery.
How does a traffic shaper benefit real-time data applications?
A traffic shaper can reserve bandwidth so that a real-time data application is guaranteed QoS (in terms of latency and jitter).
What would be a typical scenario for implementing a content switch?
Using the switch as an interface for a web server farm. The switch performs load balancing by connecting clients to different servers depending on traffic conditions and policies.
