Which of the following types of DNS records enables support for email?（）A、AB、MXC、PTRD、AAAA

第1题：

第2题：

第3题：

A company has recently switched ISPs and is being assigned a new block of public addresses.  The public web and FTP servers must be re-addressed to support this change.  After changing IP addresses and updating the DNS records many customers have reported that they are not able to access the web or FTP servers.  Which of the following could have been done prior to making these changes to make it more transparent to users？（）

• A、Reduce the TTL on the DHCP records.
• B、Configure a primary DNS server for the PTR records.
• C、Reduce the TTL on the DNS records.
• D、Configure a caching only DNS server.

第4题：

A system administrator is trying to troubleshoot company wide email problems that may be related to DNS.  Which of the following network tools would be MOST useful to determine if it is a DNS issue？（）

• A、netstat
• B、tracert
• C、nslookup
• D、ping

第5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

第6题：

An email server has been installed； however， the staff reports that they are unable to receive email from external email addresses， but they can email each other.  Which of the following is the MOST likely reason for this？（）

• A、 The company firewall is blocking SMTP ports.
• B、 The DHCP server is misconfigured.
• C、 The DNS server is only resolving internal name spaces.
• D、 The email server should be configured to resolve names by IP addresses.

第7题：

An administrator is trying to isolate the location of a persistent connectivity problem caused by a faulty NIC. Which of the following diagrams would assist the technician in finding the machine that is causing the problem?（）

• A、Physical and logical network
• B、Physical network
• C、Logical network
• D、DHCP tables and DNS records

第8题：

Which of the following server types will assign a unique address to the client’s machines？（）

• A、WINS
• B、DHCP
• C、NTP
• D、DNS

第9题：

Which of the following wireless standards was the FIRST standard to be ratified and is used to support legacy wireless devices?（）

• A、802.11a
• B、802.11g
• C、802.11b
• D、802.11n

第10题：

以下哪种DNS记录可启用电子邮件支持？（）

• A、A
• B、MX
• C、PTR
• D、AAAA

第11题：

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第15题：

Which of the following processor socket types would support an AMD processor?（）

• A、F
• B、LGA
• C、940
• D、775
• E、1155

第16题：

Which of the following SQL*Loader parameters enables you to load a specified number of records stored in the data file？（）

• A、ROWS
• B、SKIP
• C、LOAD
• D、BINDSIZE

第17题：

Which of the following server types allows resolution of domain names to IP addresses？（）

• A、DHCP server
• B、DNS server
• C、Web server
• D、VLAN server

第18题：

A user can receive email but cannot send email with the email client software. Which of the following protocols is incorrectly configured?（）

• A、FTP
• B、SMTP
• C、POP
• D、SNMP

第19题：

Which of the following traffic types would a network layer firewall be unable to filter?（）

• A、SMTP traffic
• B、ICMP messages
• C、HTTP traffic
• D、Email sender verification

第20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

第21题：

Which of the following types of DNS records enables support for email？（）

• A、 A
• B、 MX
• C、 PTR
• D、 AAAA

第22题：

以下不属于DNS记录类型的是（）。

• A、HINIFO
• B、MX
• C、PTR
• D、A

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第24题：