Which of the following holds multiple connections and is usually maintained by the telephone company?（）

单项选择题Which of the following DNS record types provides the hostname to IP address mapping?（）

A. A record
B. NS record
C. CNAME record
D. MX record

单项选择题Which of the following should be updated when new computers are purchased?（）

A. Asset management
B. Change management
C. Cable management
D. Baselines

单项选择题Which of the following wireless technologies can support the GREATEST distance on either 2.4GHz or 5GHz frequencies?（）

A.802.11a
B.802.11b
C.802.11g
D.802.11n

单项选择题Which of the following protocols can be found at the application layer?（）

A.Telnet
B.TCP
C.SNMP
D.UDP

单项选择题The network administrator has just finished installing a new 10 100 1000 switch, but receives reports from the server administrator that servers connected to the new switch seem to be experiencing slow LAN connections. The network administrator checks the port connecting the new switch to the core switch and sees the following information: Which of the following is the MOST likely cause of the slow connections?（）

A. The servers have not had VLAN tagging enabled on their NICs.
B. Speed and duplex have not been set.
C. VLAN tagging was not set on the trunk.
D. The servers have been connected with CAT5 cable.