A medium-sized company has a Class C IP address. It has two

第1题：

Which three of the following descriptions are true about the firewall modes？ （）

• A、 Transparent mode is layer 2.
• B、 Routed mode is layer 3.
• C、 Routed mode has 1 IP address.
• D、 Transparent mode has 1 IP address.

第2题：

class A {  A（） { }  }  class B extends A {  }  Which two statements are true？（）

• A、 Class B’s constructor is public.
• B、 Class B’s constructor has no arguments.
• C、 Class B’s constructor includes a call to this（）.
• D、 Class B’s constructor includes a call to super（）.

第3题：

第4题：

A medium-sized company has a Class C IP address. It has two Cisco routers and one non-Cisco router. All three routers are using RIP version 1. The company network is using the block of 198.133.219.0/24. The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM. What is the best course of action if the company wants to have 40 hosts in each of the three subnets?（）

• A、Convert all the routers to EIGRP and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.
• B、Maintain the use of RIP version 1 and use 198.133.219.32/27, 198.133.219.64/27, and 133.219.92/27 as the new subnetworks.
• C、Convert all the routers to EIGRP and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.
• D、Convert all the routers to RIP version 2 and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.
• E、Convert all the routers to OSPF and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
• F、Convert all the routers to static routes and use 198.133.219.16/28, 198.133.219.32/28, and

第5题：

A server has been assigned the 192.168.100.127/25 IP address. The server is experiencing strange network connectivity related problems. Which of the following would BEST describe the problem?（）

• A、IP address is classful.
• B、IP address is a subnet broadcast address.
• C、IP address is a subnet network address.
• D、IP address is classless

第6题：

You are the network administrator of a medium-sized company， and users are complaining that they cannotsend emails to some organizations. During your troubleshooting， you notice that your DNS MX record isblacklisted by several public blacklist filters. After clearing these listings for your IP address， and assumingthat your email server has the right virus protection in place， what are two possible solutions to prevent thisfrom happening in the future？（）

• A、Change your Internet provider.
• B、Change your public IP address.
• C、Allow the email server to send traffic only to TCP port 25.
• D、Put your email server in a DMZ.
• E、Use a separate public IP address for your email server only.

第7题：

our company has four DNS servers that run windows 2008. Each server has a static ip address. You need to prevent dhcp from assigning the addresses of the DNS servers to DHCP clients. What should you do?（）

• A、Create a new scope for the DNS servers.
• B、Create a reservation for the DHCP serve.
• C、Configure the 005 name servers scope option.
• D、Configure an exclusion that contains the ip addresses of the four DNS servers.

第8题：

第9题：

You have a Bridged 1483 service offering where each ATM PVC is assigned a /30 subnet. What are two characteristics of this configuration？（）

• A、It burns IP addresses.
• B、It conserves IP addresses.
• C、Both the client and the ERX Edge Router have IP addresses.
• D、The client has an IP address， but the ERX Edge Router uses an unnumbered address.

第10题：

A computer that has dynamic IP addressing is not receiving an IP address. Which of the following is MOST likely the problem?（）

• A、SNMP
• B、DHCP
• C、DNS
• D、NAT