CH1: Networking Fundamentals

Question 1

Which of the statements below accurately describe basic network concepts? (Select two.)
A. A computing network is a group of computing resources that permit digital data exchange between routers.
B. A LAN is a group of computing devices in the same place, all interconnected via a router.
C. A WAN is a group of computer resources that can communicate over large geographical distances.
D. A protocol is a set of rules that computer devices follow to establish and maintain communications.

Answer 1

C, D

Question 2

Match the OSI reference model layer to an appropriate description: physical, network, application, transport, and data link.

A. Involves routers that send packets
B. End users interact with this layer
C. Involves protocols like TCP and UDP
D. Involves switches that send frames

Answer 2

A. network
B. Application
C. Transport
D. Data Link

Question 3

T/F: The layer 2 protocol data unit (PDU) includes the headers for layers 3 through 7.

Answer 3

True

Question 4

Which of the statements below accurately describe physical media? (Select two.)

A. Copper cabling variants include shielded twisted pair (STP) and unshielded twisted pair (UTP).

B. Multimode (MM) fiber optic cable can typically handle longer distance transmissions at a lower cost than single mode (SM) fiber.

C. You typically use direct-attached copper (DAC) cables to directly connect two servers or other end systems to each other.

D. Wi-Fi devices transmit data by modifying aspects of radio waves, such as amplitude, phase, or frequency.

E. Multicast traffic is used to transmit data from one host to all other hosts on a
LAN.

Answer 4

A, D

Question 5

Match the TCP/IP stack layer (network interface, application, transport, and internet) to the appropriate description.

A. Maps to three specific layers of the OSI model

B. You might have an Ethernet or wireless NIC at this layer

C. Deals with IP addresses

D. Passes data to the application layer

Answer 5

A. Application layer
B. Network Access layer
C. Network layer
D. Transport layer

Question 6

Your colleague is new to networking and asks you about network devices. Which statements below would help your colleague understand this topic?
(Select two.)

A. You use switches to connect many end systems together, at layer 3 of the OSI
model.

B. Routers are often used in WAN environments, and forward packets based on IP address information.

C. Multilayer switches perform functions of a firewall and a router.

D. Stateful firewalls have more intelligence than stateless firewalls, perhaps including application awareness features.

Answer 6

B, D

Question 7

Do wired and wireless client both connect to the LAN using Ethernet?

Answer 7

No. Only the wired clients do.

Question 8

On an Ethernet cross-over cable which pins are not straight through? i.e. what are the pinouts?

Answer 8

1-2 connect to 3-6 at the other end of the cable.

Question 9

Which devices require cross-over cables to connect directly out of these devices? router, switch, hub, WAP, and PC

Answer 9

PC-router, switch-switch and Hub-switch.

Question 10

Ethernet FCS field. How long is it, where is it located, and what is it used for?

Answer 10

The length is 4 bytes, located in the trailer, used for error detection - not correction, only detection.

Question 11

802.11 standards define what?

Answer 11

WLANs

Question 12

802.3 standards define what?

Answer 12

Ethernet.

Question 13

What is auto-mdix?

Answer 13

modern technology that changes logic in devices to allow straight through cables to be used for all devices.

Question 14

How many bytes is a MAC address?

Answer 14

6

Question 15

What are the fields with the number of bytes of each, in order, of an ethernet frame?

Answer 15

Preamble(7),SFD(1), Dest(6), Source(6), Type(2), Data and Padding(46-1500), FCS(4)

Question 16

What is an OUI? and how many bytes is it?

Answer 16

Organizationally Unique Identifier, 3 bytes or 6 hex digits

Question 17

What is the Ethernet broadcast address?

Answer 17

FFFF.FFFF.FFFF

Question 18

What does the Type field do in an ethernet header?

Answer 18

The two byte type defines the L3 protocol that is encapsulated within the frame. (IEEE refers to this as EtherType)

Question 19

What port(s) are used by:

File Transfer Protocol (FTP)

Answer 19

Port 20/21

Question 20

What port(s) are used by:

Secure Shell (SSH)

Answer 20

Port 22

Question 21

What port(s) are used by:

Secure File Transfer Protocol (SFTP)

Answer 21

Port 22

Question 22

What port(s) are used by:

Telnet

Answer 22

Port 23

Question 23

What port(s) are used by:

Simple Mail Transfer Protocol (SMTP)

Answer 23

Port 25

Question 24

What port(s) are used by:

Domain Name System (DNS)

Answer 24

Port 53

Question 25

What port(s) are used by: Dynamic Host Configuration Protocol (DHCP)

Answer 25

Port 67/68

Question 26

What port(s) are used by: Trivial File Transfer Protocol (TFTP)

Answer 26

Port 69

Question 27

What port(s) are used by: Hypertext Transfer Protocol (HTTP)

Answer 27

Port 80

Question 28

What port(s) are used by: Post Office Protocol V3 (POP3)

Answer 28

Port 110

Question 29

What port(s) are used by: Network Time Protocol (NTP)

Answer 29

Port 123

Question 30

Internet Message Access Protocol (IMAP)

Answer 30

Port 143

Question 31

What port(s) are used by: Simple Network Management Protocol (SNMP)

Answer 31

Port 161/162

Question 32

What port(s) are used by: Lightweight Directory Access Protocol (LDAP)

Answer 32

Port 389

Question 33

What port(s) are used by: Hypertext Transfer Protocol Secure (HTTPS)[Secure Sockets Layer (SSL)]

Answer 33

Port 443

Question 34

What port(s) are used by: Server Message Block (SMB)

Answer 34

Port 445

Question 35

What port(s) are used by: Syslog

Answer 35

Port 514

Question 36

What port(s) are used by: SMTP TLS

Answer 36

Port 587

Question 37

What port(s) are used by: Lightweight Directory Access Protocol (over SSL) (LDAPS)

Answer 37

Port 636

Question 38

What port(s) are used by: IMAP over SSL

Answer 38

Port 993

Question 39

What port(s) are used by: POP3 over SSL

Answer 39

Port 995

Question 40

What port(s) are used by: Structured Query Language (SQL) Server

Answer 40

Port 1433

Question 41

What port(s) are used by: SQLnet

Answer 41

Port 1521

Question 42

What port(s) are used by: MySQL

Answer 42

Port 3306

Question 43

What port(s) are used by: Remote Desktop Protocol (RDP)

Answer 43

Port 3389

Question 44

What is this protocol used for: FTP

Answer 44

Used for the transfer of computer files from a server to a client on a computer network

Question 45

What is this protocol used for: SSH

Answer 45

Operating network services securely over an unsecured network

Question 46

What is this protocol used for: SFTP

Answer 46

Uses secure shell encryption to provide a high level of security for sending and receiving file transfers

Question 47

What is this protocol used for: Telnet

Answer 47

Provides a command line interface for communication with a remote device or server

Question 48

What is this protocol used for: SMTP

Answer 48

Used by mail servers to send, receive, and relay outgoing email between senders and receivers

Question 49

What is this protocol used for: DNS

Answer 49

Helps Internet users and network devices discover websites using human-readable host-names, instead of numeric IP addresses

Question 50

What is this protocol used for: DHCP

Answer 50

Provides an Internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway

Question 51

What is this protocol used for: TFTP

Answer 51

Allows a client to get a file from or put a file onto a remote host

Question 52

What is this protocol used for: HTTP

Answer 52

An application layer protocol designed to transfer information between networked devices and runs on top of other layers of the network protocol stack

Question 53

What is this protocol used for: POP3

Answer 53

An application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server

Question 54

What is this protocol used for: NTP

Answer 54

Allows the synchronization of system clocks (from desktops to servers)

Question 55

What is this protocol used for: IMAP

Answer 55

Used by email clients to retrieve email messages from a mail server over a TCP/IP connection

Question 56

What is this protocol used for: SNMP

Answer 56

Used to monitor and manage network devices connected over an IP address.

Question 57

What is this protocol used for: LDAP

Answer 57

Used to lookup information or devices within a network

Question 58

What is this protocol used for: HTTPS

Answer 58

An extension of the Hypertext Transfer Protocol. It uses encryption for secure communication over a computer network

Question 59

What is this protocol used for: SSL

Answer 59

A security protocol that provides privacy, authentication, and integrity to Internet communications

Question 60

What is this protocol used for: TLS

Answer 60

Facilitate privacy and data security for communications over the Internet. Upgraded version of SSL

Question 61

What is this protocol used for: SMB

Answer 61

Used for sharing access to files, printers, serial ports and other resources on a network

Question 62

What is this protocol used for: Syslog

Answer 62

Computer systems use to send event data logs to a central location for storage

Question 63

What is this protocol used for: SMTP TLS

Answer 63

Used by mail servers to send, receive, and relay outgoing email between senders and receivers using TLS to secure the data

Question 64

What is this protocol used for: LDAPS

Answer 64

Uses TLS/SSL to lookup information or devices within a network

Question 65

What is this protocol used for: IMAP over SSL

Answer 65

Used by email clients to retrieve email messages from a mail server over a TCP/IP connection using SSL to secure the information

Question 66

What is this protocol used for: POP3 over SSL

Answer 66

An application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server securely using SSL

Question 67

What is this protocol used for: SQL Server

Answer 67

Supports client communication with the TCP/IP network protocol and the named pipes protocol (Microsoft)

Question 68

What is this protocol used for: SQLnet

Answer 68

Used by Oracle SQL servers to execute SQL commands from clients, including load balancing and application-specific services

Question 69

What is this protocol used for: MySQL

Answer 69

Facilitates communication between a MySQL client and a MySQL server. It is designed to enable the transmission of SQL queries and the reception of query results between the two parties

Question 70

What is this protocol used for: RDP

Answer 70

Provides a user with a graphical interface to connect to another computer over a network connection

Question 71

What is this protocol used for: SIP

Answer 71

Enables the Voice Over Internet Protocol (VoIP) by defining the messages sent between endpoints and managing the actual elements of a call

Question 72

Which of the following protocols are examples of TCP/IP transport layer protocols? (Choose two answers.) a. Ethernet b. HTTP c. IP d. UDP e. SMTP f. TCP

Answer 72

D and F HTTP, SMTP - layer 7 IP - layer 3

Question 73

Which of the following protocols are examples of TCP/IP data link layer protocols? (Choose two answers.) a. Ethernet b. HTTP c. IP d. UDP e. SMTP f. TCP g. PPP

Answer 73

A and G

Question 74

The process of HTTP asking TCP to send some data and making sure that it is received correctly is an example of what? a. Same-layer interaction b. Adjacent-layer interaction c. OSI model d. All of these answers are correct.

Answer 74

B

Question 75

``` The process of TCP on one computer marking a TCP segment as segment 1, and the receiving computer then acknowledging the receipt of TCP segment 1 is an example of what? a. Data encapsulation b. Same-layer interaction c. Adjacent-layer interaction d. OSI model e. All of these answers are correct. ```

Answer 75

B

Question 76

The process of a web server adding a TCP header to the contents of a web page, followed by adding an IP header and then adding a data link header and trailer, is an example of what? a. Data encapsulation b. Same-layer interaction c. OSI model d. All of these answers are correct.

Answer 76

A

Question 77

Which of the following terms is used specifically to identify the entity created when encapsulating data inside data link layer headers and trailers? a. Data b. Chunk c. Segment d. Frame e. Packet

Answer 77

D

Question 78

Which OSI layer defines the functions of logical network-wide addressing and routing? a. Layer 1 b. Layer 2 c. Layer 3 d. Layer 4 e. Layer 5, 6, or 7

Answer 78

C

Question 79

Which OSI layer defines the standards for cabling and connectors? a. Layer 1 b. Layer 2 c. Layer 3 d. Layer 4 e. Layer 5, 6, or 7

Answer 79

A

Question 80

In the LAN for a small office, some user devices connect to the LAN using a cable, while others connect using wireless technology (and no cable). Which of the following is true regarding the use of Ethernet in this LAN? a. Only the devices that use cables are using Ethernet. b. Only the devices that use wireless are using Ethernet. c. Both the devices using cables and those using wireless are using Ethernet. d. None of the devices are using Ethernet.

Answer 80

A

Question 81

Which of the following Ethernet standards defines Gigabit Ethernet over UTP cabling? a. 10GBASE-T b. 100BASE-T c. 1000BASE-T d. None of the other answers is correct.

Answer 81

C

Question 82

Which of the following is true about Ethernet crossover cables for Fast Ethernet? a. Pins 1 and 2 are reversed on the other end of the cable. b. Pins 1 and 2 on one end of the cable connect to pins 3 and 6 on the other end of the cable. c. Pins 1 and 2 on one end of the cable connect to pins 3 and 4 on the other end of the cable. d. The cable can be up to 1000 meters long to cross over between buildings. e. None of the other answers is correct.

Answer 82

B

Question 83

Each answer lists two types of devices used in a 100BASE-T network. If these devices were connected with UTP Ethernet cables, which pairs of devices would require a straight-through cable? (Choose three answers.) a. PC and router b. PC and switch c. Hub and switch d. Router and hub e. Wireless access point (Ethernet port) and switch

Answer 83

B, D, and E

Question 84

Which of the following is true about the CSMA/CD algorithm? a. The algorithm never allows collisions to occur. b. Collisions can happen, but the algorithm defines how the computers should notice a collision and how to recover. c. The algorithm works with only two devices on the same Ethernet. d. None of the other answers is correct.

Answer 84

B

Question 85

Which of the following is true about the Ethernet FCS field? a. Ethernet uses FCS for error recovery. b. It is 2 bytes long. c. It resides in the Ethernet trailer, not the Ethernet header. d. It is used for encryption.

Answer 85

C

Question 86

Which of the following are true about the format of Ethernet addresses? (Choose three answers.) a. Each manufacturer puts a unique OUI code into the first 2 bytes of the address. b. Each manufacturer puts a unique OUI code into the first 3 bytes of the address. c. Each manufacturer puts a unique OUI code into the first half of the address. d. The part of the address that holds this manufacturer’s code is called the MAC. e. The part of the address that holds this manufacturer’s code is called the OUI. f. The part of the address that holds this manufacturer’s code has no specific name.

Answer 86

B, C, and E

Question 87

Which of the following terms describe Ethernet addresses that can be used to send one frame that is delivered to multiple devices on the LAN? (Choose two answers.) a. Burned-in address b. Unicast address c. Broadcast address d. Multicast address

Answer 87

C and D

Question 88

Which of the following header fields identify which TCP/IP application gets data received by the computer? (Choose two answers.) a. Ethernet Type b. SNAP Protocol Type c. IP Protocol d. TCP Port Number e. UDP Port Number

Answer 88

D, E

Question 89

Which of the following are typical functions of TCP? (Choose four answers.) a. Flow control (windowing) b. Error recovery c. Multiplexing using port numbers d. Routing e. Encryption f. Ordered data transfer

Answer 89

A, B, C, F

Question 90

Which of the following functions is performed by both TCP and UDP? a. Windowing b. Error recovery c. Multiplexing using port numbers d. Routing e. Encryption f. Ordered data transfer

Answer 90

C

Question 91

What do you call data that includes the Layer 4 protocol header, and data given to Layer 4 by the upper layers, not including any headers and trailers from Layers 1 to 3? (Choose two answers.) a. L3PDU b. Chunk c. Segment d. Packet e. Frame f. L4PDU

Answer 91

C, F

Question 92

In the URI http://www.certskills.com/ICND1, which part identifies the web server? a. http b. www.certskills.com c. certskills.com d. http://www.certskills.com e. The file name.html includes the hostname.

Answer 92

B

Question 93

Fred opens a web browser and connects to the www.certskills.com website. Which of the following are typically true about what happens between Fred’s web browser and the web server? (Choose two answers.) a. Messages flowing toward the server use UDP destination port 80. b. Messages flowing from the server typically use RTP. c. Messages flowing to the client typically use a source TCP port number of 80. d. Messages flowing to the server typically use TCP.

Answer 93

C, D