ENetwork Chapter 7

1   
What is a characteristic of a logical point-to-point topology?

•     The media access control protocol can be very simple.

   
2   
What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.)

•     They are 48 binary bits in length.
•     They are considered physical addresses.
•     They are generally represented in hexadecimal format.

   
3   
What two facts are true when a device is moved from one network or subnet to another? (Choose two.)

•     The device will still operate at the same Layer 2 address.
•     The Layer 3 address must be reassigned to allow communications to the new network.

4   
What is a primary purpose of encapsulating packets into frames?

•     facilitate the entry and exit of data on media

   
5   
Which options are properties of contention-based media access for a shared media? (Choose three.)

•     non-deterministic
•     less overhead
•     collisions exist

   
6   
What is the purpose of the preamble in an Ethernet frame?
    is used for timing synchronization
   
7   
What is a function of the data link layer?

•     provides for the exchange data over a common local media

8   
What statements are true regarding addresses found at each layer of the OSI model? (Choose two.)

•     Layer 2 may identify devices by a physical address burned into the network card
•     Layer 3 represents a hierarchical addressing scheme

   
9   

Refer to the exhibit. How many CRC calculations will take place as traffic routes from the PC to the laptop?

•     8

   
10   
What is the primary purpose of the trailer in a data link layer frame?

•     support frame error detection

   
11   
Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer?

•     MAC

   
12   

Refer to the exhibit. A frame is being sent from the PC to the laptop. Which source MAC and IP addresses will be included in the frame as it leaves RouterB? (Choose two.)

•     source MAC - Fa0/1 on RouterB
•     source IP - PC

   
13   
What is true concerning physical and logical topologies?

•     Logical topologies consist of virtual connections between nodes.

14   

Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?

•     Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.

   
15   
Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)

•     the geographic scope of the network
•     the physical layer implementation
•     the number of hosts to be interconnected

   
16   
What is true regarding media access control? (Choose three.)

•     Ethernet utilizes CSMA/CD
•     defined as placement of data frames on the media
•     Data Link layer protocols define the rules for access to different media

   
17   
A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing?

•     physical topology

   
18   
Which statements describe the logical token-passing topology? (Choose two.)

•     Computers are allowed to transmit data only when they possess a token.
•     Electronic tokens are passed sequentially to each other.

   
19   
What determines the method of media access control? (Choose two.)

•     media sharing
•     logical topology

   
20   

Refer to the exhibit. Assuming that the network in the exhibit is converged meaning the routing tables and ARP tables are complete, which MAC address will Host A place in the destination address field of Ethernet frames destined for www.server?

•     00-0c-85-cf-65-c0

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ENetwork Chapter 6

1   
Which statements are true regarding IP addressing? (Choose two.)

•     Private addresses are blocked from public Internet by router.
•     IP address 127.0.0.1 can be used for a host to direct traffic to itself.

2   
A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?

•     172.16.192.160

   
3   

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 default gateway is on a different subnet from the host.

4   
What two things will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away? (Choose two.)

•     The router will discard the packet.
•     The router will send a time exceeded message to the source host.

   
5   
What is a group of hosts called that have identical bit patterns in the high order bits of their addresses?

•     a network

   
6   
Which of the following network devices are recommended to be assigned static IP addresses? (Choose three.)

•     servers
•     network printers
•     routers

   
7   

Refer to the exhibit. Which network prefix will implement the IP addressing scheme for the LANs shown in the graphic?

•     /27

   
8   

Refer to the exhibit. Why would the response shown be displayed after issuing the command ping 127.0.0.1 on a PC?

•    Internet Protocol is not properly installed on the host.

   
9   

Refer to the exhibit. A network administrator discovers that host A is having trouble with Internet connectivity, but the server farm has full connectivity. In addition, host A has full connectivity to the server farm. What is a possible cause of this problem?

•     NAT is required for the host A network.

10   
What is the primary reason for development of IPv6?

•     expanded addressing capabilities

   
11   
How many bits make up an IPv4 address?

•     32

12   
Which process do routers use to determine the subnet network address based upon a given IP address and subnet mask?

•     binary ANDing

13   
Which IPv4 subnetted addresses represent valid host addresses? (Choose three.)

•     172.16.4.155 /26
•     172.16.4.193 /26
•     172.16.4.207 /27

14   
What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?

•     255.255.255.0

   
15   
Which of the following are features of IPv6? (Choose three.)

•     larger address space
•     simplified header format
•     authentication and encryption

16   
Which three IP addresses are private? (Choose three.)

•     10.35.66.70
•     192.168.99.5
•     172.18.88.90

   

17   

Refer to the exhibit. A network administrator has to develop an IP addressing scheme that uses the 192.168.1.0 /24 address space. The network that contains the serial link has already been addressed out of a separate range. Each network will be allocated the same number of host addresses. Which network mask will be appropriate to address the remaining networks?

•     255.255.255.192

   
18   
What is the network address of the host 172.25.67.99 /23 in binary?

•     10101100.00011001.01000010.00000000

   
19   
What three facts are true about the network portion of an IPv4 address? (Choose three.)

•     is identical for all hosts in a broadcast domain
•     varies in length
•     is used to forward packets

   
20   

Refer to the exhibit. The network administrator has assigned the internetwork of LBMISS an address range of 192.168.10.0. This address range has been subnetted using a /29 mask. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the new network (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the workgroup server's properties to allow connectivity to the network?

•     IP address: 192.168.10.38 subnet mask: 255.255.255.248 default gateway: 192.168.10.33

   
21   
Given the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this address?

•     This is a network address.

   

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ENetwork Chapter 5

1   
What is a component of a routing table entry?

•     the next-hop address

2   

Refer to the exhibit. The network in the exhibit is fully operational. What two statements correctly describe the routing for the topology that is shown? (Choose two.)

•     192.168.0.2 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 network to the 172.16.0.0 network.
•     192.168.0.1 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.

   
3   
What is the purpose of a default gateway?

•     identifies the device that allows local network computers to communicate with devices on other networks

4   

Refer to the exhibit. All devices shown in the exhibit have factory default settings. How many broadcast domains are represented in the topology that is shown?

•     4

   
5   
Which intermediary devices could be used to implement security between networks? (Choose two.)

•     router
•     firewall

   
6   
What are three common problems with a large network? (Choose three.)

•     performance degradation
•     security issues
•     host identification

   
7   

Refer to the exhibit. Using the network in the exhibit, what would be the default gateway address for host A in the 192.133.219.0 network?

•     192.133.219.1

   
8   

Refer to the exhibit. A network administrator notices that there are too many broadcasts on the network. What two steps can the network administrator take to resolve this problem? (Choose two.)

•     Replace S2 with a router.
•     Subnet the 192.168.0.0 /24 network.

   
9   
What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)

•     provide routers with up-to-date routing tables
•     consume bandwidth to exchange route information

   
10   
In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another?

•     destination network address

   
11   

Refer to the exhibit. A network administrator is troubleshooting a connectivity problem and needs to determine the address that is used to forward network packets out the network. Using the netstat -r command, the administrator would identify which address as the address to which all hosts send packets that are destined for an outside network?

•     10.10.10.6

   
12   
Which portion of the network layer address does a router use to forward packets?

•     network portion

   
13   
What information is added during encapsulation at OSI Layer 3?

•    source and destination IP address

14   
Which three statements are true about routes and their use? (Choose three.)

•     If the destination network is directly connected, the router forwards the packet to the destination host.
•     If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.
•     If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.

   
15   
What statement describes the purpose of a default route?

• A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.

16   
When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)

•     The router discards the packet.
•     The router forwards the packet out the interface indicated by the default route entry.

17   
In a connectionless system, which of the following is correct?

•     The destination is not contacted before a packet is sent.

   
18   
If the default gateway is configured incorrectly on the host, what is the impact on communications?

•     The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.

   
19   
What are the key factors to consider when grouping hosts into a common network? (Choose three.)

•     purpose
•     geographic location
•     ownership

20   
Which IP packet field will prevent endless loops?

•     time-to-live

   
21   
What type of routing uses information that is manually entered into the routing table?

•     static

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ENetwork Chapter 4

1
Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

•     reach a timeout and resend the data that needs to be acknowledged

   
2   
Which information is found in both the TCP and UDP header information?

•    source and destination port

3   
After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

•     80

   
4   
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

•     0 to 1023

   
5   
Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? (Choose three.)

•     flow control
•     session establishment
•     numbering and sequencing

6  

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)

•     The local host is using three client sessions.
•     The local host is using web sessions to a remote server.

   
7   

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

•     This contains a Telnet request.
•     This is a TCP header.

8   
What are two features of the User Datagram Protocol (UDP)? (Choose two.)

•     low overhead
•     connectionless

   
9   
What is dynamically selected by the source host when forwarding data?

•     source port

10   
Why is flow control used for TCP data transfer?

•     to prevent the receiver from being overwhelmed by incoming data

   
11   
During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

•     The packets will be delivered and reassembled at the destination.

   
12   

Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?

•     Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.

13   
Which two options represent Layer 4 addressing? (Choose two.)

•     identifies the communicating applications
•     identifies multiple conversations between the hosts

   
14   
Which event occurs during the transport layer three-way handshake?

•     TCP initializes the sequence numbers for the sessions.

   
15   
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

•     transport

16   
Which is an important characteristic of UDP?

•     minimal delays in data delivery

17   
What mechanism is used by TCP to provide flow control as segments travel from source to destination?

•     window size

18   
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

•     UDP

19   
Why are port numbers included in the TCP header of a segment?

•     to enable a receiving host to forward the data to the appropriate application

20   

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

•     session establishment

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