Network+ Extra 12

Question 1

Whereas DSSS uses a high modulation rate for the symbols it sends, ? uses a relatively slow modulation rate for symbols. This slower modulation rate, combined with the simultaneous transmission of data over 52 data streams, helps ? support high data rates while resisting interference between the various data streams.

Answer 1

Orthogonal frequency-division multiplexing (OFDM)

Question 2

802. 11 — 2.4GHz / 1Mbps or 2Mbps / DSSS or FHSS 20 m indoors / 100 m outdoors
803. 11a — 5GHz / 54Mbps / OFDM 35 m indoors / 120 m outdoors
804. 11b — 2.4GHz / 11Mbps / DSSS 35 m indoors / 140 m outdoors
805. 11g — 2.4GHz / 54Mbps / OFDM or DSSS 38 m indoors / 140 m outdoors
806. 11n — 2.4GHz or 5GHz (or both) > 300Mbps (with channel bonding) OFDM 70 m indoors / 250 m outdoors
807. 11ac — 5GHz > 3Gbps (with MU-MIMO and several antennas) OFDM Similar to 802.11n operating at 5 GHz

Answer 2

802.11 Standards

Question 3

Delegates a DNS zone to use the given authoritative name servers.

Answer 3

NS

Question 4

is an alias of an existing record, thus allowing multiple DNS records to map to the same IP address.

Answer 4

CNAME

Question 5

connect to storage arrays using existing IP based networks, initiator allows to send commands across the network (connect to storage). The storage is a target and commands are called CDB’s.

Answer 5

iSCSI

Question 6

where the company rents virtualized servers (which are hosted by a service provider) and then runs specific applications on those servers.

Answer 6

IaaS

Question 7

connection between cable modem and ISP is the protocol DOCSIS

Answer 7

DOCSIS