99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<ins id="pokkp"></ins>

單項選擇題

Several users are sending emails to CompTIA.org. but they are not being received. Which of thefollowing commands could be used to verify that the company is able to connect to the mailservice at CompTIA.org?（）

A.Ping
B.Arp
C.Dig
D.telnet

你可能感興趣的試題

單項選擇題

Which of the following devices can be installed on individual computers throughout the network?（）

A. NIPS
B. Network-based firewall
C. VPN concentrator
D. Host-based firewall

單項選擇題

Which of the following protocols can be used to retrieve system and network performance information from a router?（）

A.LDAP
B.IMAP
C.TFTP
D.SNMP

<ruby id="zhcos"><xmp id="zhcos"></xmp></ruby>
<blockquote id="zhcos"><acronym id="zhcos"></acronym></blockquote>

<em id="zhcos"></em>

<ruby id="zhcos"><xmp id="zhcos"></xmp></ruby>