HP HP0-Y49 - Questions & Answers

Explanation:
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol Suite used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802 local area network, principally wired Ethernet. Media Endpoint Discovery is an enhancement of LLDP, known as LLDP-MED, that provides the following facilities: Auto-discovery of LAN policies (such as VLAN, Layer 2 Priority and Differentiated services settings) enabling plug and play networking. Device location discovery to allow creation of location databases and, in the case of Voice over Internet Protocol (VoIP), Enhanced 911 services. Extended and automated power management of Power over Ethernet (PoE) end points.

Explanation:
IEEE 802.11n is an amendment to IEEE 802.11-2007 as amended by IEEE 802.11k-2008, IEEE 802.11r- 2008, IEEE 802.11y-2008, and IEEE 802.11w-2009, and builds on previous 802.11 standards by adding multiple-input multiple-output (MIMO) and 40 MHz channels to the PHY (physical layer), and frame aggregation to the MAC layer. MIMO is a technology that uses multiple antennas to coherently resolve more information than possible using a single antenna. One way it provides this is through Spatial Division Multiplexing (SDM), which spatially multiplexes multiple independent data streams, transferred simultaneously within one spectral channel of bandwidth. MIMO SDM can significantly increase data throughput as the number of resolved spatial data streams is increased.

Explanation:
The switch event log is stored in volatile memory and is lost on a reboot. It is best to configure a syslog server to handle the log on another server in non-volatile memory.
For syslog:
HP-Provision-Switch (config)# logging <IPv4 or IPv6 address> Reference:
http://h10032.www1.hp.com/ctg/Manual/c02667379.pdf

Explanation:
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-6W710/01/201301/772595_1285_0.htm

Explanation:
MSTP selects the device with the lowest MAC address as the root bridge, so in this case it is SwitchD. The root bridge is the only bridge in the network that does not have a root port. All other bridges receive BPDUs on at least one port.

Explanation:
Acting as the system information hub, information center classifies and manages system information, offering a powerful support for network administrators and developers in monitoring network performance and diagnosing network problems. The following describes the working process of information center: Receives the log, trap, and debugging information generated by each module. Outputs the above information to different information channels according to the user-defined output rules.
Outputs the information to different destinations based on the information channel-to-destination associations.

Explanation:
Authentication fallback
If all authentication servers are unavailable, local authentication can be used. Local authentication can use the password control function to secure user passwords.
References:
https://h20565.www2.hp.com/portal/site/hpsc/template.BINARYPORTLET/public/kb/docDisplay/resource.process/?spf_p.tpst=kbDocDisplay_ws_BI&spf_p.rid_kbDocDisplay=docDisplayResURL&javax.portlet.begCacheTok=com.vignette.cachetoken&spf_p.rst_kbDocDisplay=wsrp-resourceState%3DdocId%253Demr_na-c03536920-4%257CdocLocale%253Den_US&javax.portlet.endCacheTok=com.vignette.cachetoken