DsmbISP Chapter 4 - CCNA Discovery: Working at a Small-to-Medium Business or ISP - Version 4.1 2013

1	Refer to the exhibit. Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configuration of the host is shown in the exhibit. What could be the cause of the problem? The host subnet mask is incorrect. The default gateway is a network address. The default gateway is a broadcast address. The default gateway is on a different subnet from the host.

2	Refer to the exhibit. Which range of IP addresses would allow hosts that are connected to the Router1 Fa0/0 interface to access outside networks? 192.168.1.0 through 192.168.1.95 192.168.1.66 through 192.168.1.94 192.168.1.66 through 192.168.1.96 192.168.1.0 through 192.168.1.127 192.168.1.66 through 192.168.1.128

3	What is the range of the first octet in a Class B address? 127 to 191 127 to 192 128 to 191 128 to 192

4

Which two statements describe classful IP addresses? (Choose two.) It is possible to determine which class an address belongs to by reading the first bit. The number of bits used to identify the hosts is fixed by the class of the network. Only Class A addresses can be represented by high-order bits 100. Up to 24 bits can make up the host portion of a Class C address. All subnets in a network are the same size. Three of the five classes of addresses are reserved for multicasts and experimental use.

5	Which IPv4 class provides the highest number of host addresses per network? Class A Class B Class C Class D Class E

6	Convert the decimal number 231 into its binary equivalent. Select the correct answer from the list below. 11110010 11011011 11110110 11100111 11100101 11101110

7	Which IPv4 class of addresses provides the most networks? Class A Class B Class C Class D Class E

8	How many usable hosts are available given a Class C IP address with the default subnet mask? 254 255 256 510 511 512

9

A system administrator must provide Internet connectivity for ten hosts in a small remote office. The ISP has assigned two public IP addresses to this remote office. How can the system administrator configure the router to provide Internet access to all ten users at the same time? Configure static NAT for all ten users. Configure dynamic NAT for ten users. Configure dynamic NAT with overload. Configure DHCP and static NAT.

10	IPv6 increases the IP address size from 32 bits to how many bits? 64 96 128 192 256 512

11	Refer to the exhibit. R1 is performing NAT for the 10.1.1.0/24 inside network. HostA has sent a request to the web server. What is the destination IP address of the return packet from the web server? 10.1.1.2 172.30.20.1 172.30.20.10 192.168.1.1

12	What is the network broadcast address for a Class C address of 192.168.32.0 with the default subnet mask? 192.168.0.0 192.168.0.255 192.168.32.0 192.168.32.254 192.168.32.255

13	In an 8 bit binary number, what is the total number of combinations of the eight bits? 128 254 255 256 512 1024

14

Which statement accurately describes public IP addresses? Public addresses cannot be used within a private network. Public IP addresses must be unique across the entire Internet. Public addresses can be duplicated only within a local network. Public IP addresses are only required to be unique within the local network. Network administrators are free to select any public addresses to use for network devices that access the Internet.

15	Static NAT works by mapping a specific inside local IP address to what other specific address type? inside global outside local outside global private IP address

Read More

DsmbISP Chapter 2 - CCNA Discovery: Working at a Small-to-Medium Business or ISP - Version 4.1 2013

1	What is the first step that is used by a help desk technician in a systematic approach to helping a customer solve a problem? identify and prioritize alternative solutions isolate the cause of the problem define the problem select an evaluation process

2

Refer to the exhibit. Host A is unable to communicate with any other hosts. On this network is a DHCP server that is responsible for assigning addresses to hosts. Based on the output of the ipconfig command on host A, what is the most likely cause of the problem? The host did not get addressing configuration from the DHCP server. The DNS server could not be reached. The default gateway interface is down. The IP address is a public address and should be private.

3	What are two functions of the physical layer of the OSI model? (Choose two.) adding the hardware address converting data to bits encapsulating data into frames signal generation routing packets

4	What are two basic procedures of incident management? (Choose two.) opening a trouble ticket using diagnostic tools to identify the problem surveying network conditions for further analysis configuring new equipment and software upgrades adhering to a problem-solving strategy e-mailing a problem resolution to the customer

5	Which address is used by the router to direct a packet between networks? source MAC address destination MAC address source IP address destination IP address

6	Which three command line utilities are most commonly used to troubleshoot issues at Layer 3? (Choose three.) ping a packet sniffer Telnet ipconfig traceroute

7	What is the correct encapsulation order when data is passed from Layer 1 up to Layer 4 of the OSI model? bits, frames, packets, segments frames, bits, packets, segments packets, frames, segments, bits segments, packets, frames, bits

8	A customer calls to report a problem accessing an e-commerce web site. The help desk technician begins troubleshooting using a top-down approach. Which question would the technician ask the customer first? Can you access other web sites? Is there a firewall installed on your computer? What is your IP address? Is the link light lit on your NIC card?

9	In what three ways do Level 1 and Level 2 help desk technicians attempt to identify a customer's problems? (Choose three.) talking to the customer on the telephone upgrading hardware and software using various web tools making an onsite visit installing new equipment with remote desktop sharing applications

10	What are two primary goals of the ISP help desk? (Choose two.) conserving support resources network optimization competitive scalability customer retention

11	What Layer 1 problem can cause a user to lose Internet connectivity? wrong subnet mask wrong default gateway loose network cable wrong MAC address faulty printer cable

12

A customer calls the help desk about setting up a new PC and cable modem and being unable to access the Internet. What three questions would the technician ask if the bottom-up troubleshooting approach is used? (Choose three.) Is the NIC link light blinking? What is the IP address and subnet mask? Can the default gateway be successfully pinged? Is the network cable properly attached to the modem? Is the Category 5 cable properly connected to the network slot on the PC? Can you access your e-mail account?

13	Which two functions are provided by the upper layers of the OSI model? (Choose two.) placing electrical signals on the medium for transmission initiating the network communication process encrypting and compressing data for transmission segmenting and identifying data for reassembly at the destination choosing the appropriate path for the data to take through the network

14	An accounting firm experiencing connectivity issues requires Level 3 support from the ISP. Which function requires Level 3 or higher support? the diagnosis of basic network connectivity the use of diagnostic tools to identify problems the installation and configuration of new equipment the documentation of basic user issues

15	Which scenario represents a problem at Layer 4 of the OSI model? An incorrect IP address on the default gateway. A bad subnet mask in the host IP configuration. A firewall filtering traffic addressed to TCP port 25 on an email server. An incorrect DNS server address being given out by DHCP.

16	While troubleshooting a connectivity issue on a host, a network administrator issues the ping 127.0.0.1 command. The pings are unsuccessful. What is most likely the problem? The TCP/IP stack is not loaded properly. The default gateway is down. ARP is not functioning correctly. An IP address has not been assigned to the host.

17

Which statement describes the process of escalating a help desk trouble ticket? The help desk technican resolves the customer problem over the phone and closes the trouble ticket. Remote desktop utilities enable the help desk technician to fix a configuration error and close the trouble ticket. After trying unsuccessfully to fix a problem, the help desk technician sends the trouble ticket to the onsite support staff. When the problem is solved, all information is recorded on the trouble ticket for future reference.

18

A customer calls the ISP help desk after setting up a new PC with a cable modem but being unable to access the Internet. After the help desk technician has verified Layer 1 and Layer 2, what are three questions the help desk technician should ask the customer? (Choose three.) What is your subnet mask? What is your IP address? Is the NIC link light blinking? Can you ping the default gateway? Is the network cable properly attached to the cable modem? Is the network cable correctly connected to the network port on the PC?

19

The DHCP server in a lab environment is down when multiple DHCP clients in the lab are booted for the first time. Which two statements describe how the DHCP clients will be affected by the absence of a DHCP server during boot? (Choose two.) The clients will not boot completely until the DHCP server resumes functioning. The clients will attempt via the use of the IP address 127.0.0.1 to communicate with the other clients. All clients with link-local addresses will communicate with each other in a peer-to-peer manner. A link-local address will be automatically assigned to the hosts by the operating system. A link-local process will use a DNS query to determine if any other device uses the same link-local address.

20	Which is a function of the transport layer of the OSI model? routes data between networks converts data to bits for transmission delivers data reliably across the network using TCP formats and encodes data for transmission transmits data to the next directly connected device

21

In your opinion (this has no bearing on your grade), please indicate your interest in this course:

22

In your opinion (this has no bearing on your grade), please indicate how enthusiastic you are about the content of this course and the things you’re learning (or have learned):

23

In your opinion (this has no bearing on your grade), please rate your motivation to do well in this course:

Read More

DsmbISP Chapter 1 - CCNA Discovery: Working at a Small-to-Medium Business or ISP - Version 4.1 2013

1

Which two things can be determined by using the ping command? (Choose two.) the number of routers between the source and destination device the IP address of the router nearest the destination device the average time it takes a packet to reach the destination and for the response to return to the source whether or not the destination device is reachable through the network the average time it takes each router in the path between source and destination to respond

2	What is the maximum T1 transmission speed? 56 kbps 128 kbps 1.544 Mbps 2.4 Mbps

3	Which network support services team is responsible for testing a new customer connection and for monitoring the ongoing operation of the link? customer service help desk network operations on-site installation

4	At which point do individuals and small businesses connect directly to the ISP network to obtain Internet access? at a POP at an IXP at a Metro Ethernet link on the ISP extranet

5	Which ISP network support systems team will typically contact the customer once a new circuit is ready and guide the customer in setting up passwords and other account information? help desk customer service network operations center on-site installation team planning and provisioning

6	When does a host device issue an ICMP echo request? to initiate a ping to determine if a destination address is reachable to respond to a DNS name query to broadcast its identity to its locally connected neighbors to request the MAC address of a destination IP address

7	What feature enables network devices to be scalable? a fixed number of interfaces ease of repair modularity low maintenance requirements low cost

8	What three support service teams are commonly found within an ISP? (Choose three.) help desk computer support application readiness network operations center planning and provisioning implementation and documentation

9	Which network utility helps determine the location of network problems and identifies routers that packets travel across? ping ipconfig tracert netstat nslookup

10	What are three main types of high-bandwidth connection options used by medium- to large-sized businesses? (Choose three.) DSL cable modem Ethernet metro Ethernet T1 T3

11	What units are used to measure Internet bandwidth? bits per second bytes per second hertz megabytes per second packets per second

12	Refer to the exhibit. Host A cannot connect to the web server at 192.168.100.2. Based on the output of the tracert command, which device is most likely causing the problem? Router A Router B Router C Router D Router E Router F

13	Refer to the exhibit. A host is having problems maintaining a connection to a server at 192.168.100.2. Which statement best describes the output of the ping command? The server is shut down. The server has no route back to the host. Two routers along the path are not responding to pings. Some packets made it to the destination. Ping services are not supported on the destination.

14	Which statement describes a function of a Tier 1 ISP? peers with other similarly sized ISPs to form the global Internet backbone uses the services of Tier 3 ISPs to connect to the global Internet backbone pays Tier 2 ISPs for transit services to connect across continents limits the offered services to small geographic areas

15	Which network support services team identifies whether the client site has existing network hardware and circuits installed? customer service help desk network operations planning and provisioning

16	What interconnects the Internet backbone? MDFs IXPs POPs satellite dishes

17	The IT manager of a medium-sized business wishes to house the company-owned web servers in a facility that offers round-the-clock controlled access, redundant power, and high-bandwidth Internet access. Which ISP service will fulfill this need? web hosting planning and provisioning application hosting equipment collocation Tier 1 ISP services

18	What was the original purpose of the Internet? voice communication marketing research commerce

19	What is the purpose of an RFC? to provide the connection point for multiple ISPs to the Internet to document the development and approval of an Internet standard to indicate a contract that a customer signs when purchasing co-location services to document agreements between an ISP and the customer

Read More