Cisco Networking

Which number or set of numbers represents a socket?

192.168.1.1:80

Which wireless RF band do IEEE 802.11b/g devices use?

2.4 GHz

The client randomly selects a source port number.

443

Which statement describes the use of powerline networking technology?

A device connects to an existing home LAN using an adapter and an existing electrical outlet.

Host-A has an Ethernet frame to send to Host-B on the same network. Host-A knows the IP address of Host-B but not its MAC address. What message will Host-A send to determine the MAC address of Host B?

ARP request

When a LAN is connected to the internet using a wireless router, how do devices on the LAN communicate on the internet using NAT?

All devices must share the single public IPv4 address assigned to the wireless router in order to communicate to the internet via NAT.

Which statement correctly describes data transmission at the transport layer?

Both UDP and TCP use port numbers.

this is when routers in the distribution layer can limit broadcasts to the local network where they need to be heard.

Broadcast containment

Which type of device provides an Internet connection through the use of a phone jack?

DSL modem

Which three steps must be completed to manually connect an Android or IOS device to a secured wireless network?

Enter the network SSID., choose correct security type, Input the authentication password.

The destination MAC address of an Ethernet broadcast in hexadecimal is:

FFFF.FFFF.FFFF

Which destination address is used in an ARP request frame?

FFFF.FFFF.FFFF

When an Ethernet switch receives a frame that is broadcast, it will:

Forward the frame out all ports except the incoming port

Which protocol operates at the application layer of the TCP/IP model?

HTTP

Host-A sends an ARP request and receives an ARP reply from Host-B. What is in the ARP reply that Host-A did not know and needs to communicate with Host-B?

Host B's MAC address

What addresses are mapped by ARP?

IPv4 address to a destination MAC address

What is a characteristic of UDP?

It provides unreliable delivery of segments.

The ARP table in a switch maps which two types of address together?

Layer 3 address to a Layer 2 address

Physical locations

Routers in the distribution layer can be used to interconnect local networks at various locations of an organization that are geographically separated.

Logical Grouping

Routers in the distribution layer can be used to logically group users, such as departments within a company, who have common needs or for access to resources.

Security requirements

Routers in the distribution layer can separate and protect certain groups of computers where confidential information resides.

What do routing tables contain?

Routing tables contain the addresses of networks, and the best path to reach those networks.

Switches Sw1 and Sw2 have MAC address tables that are populated with all the exhibited host MAC addresses. If host H1 sends a frame with destination address FFFF.FFFF.FFFF, what will be the result

Sw1 will flood the frame out all ports except the inbound port. The frame will be flooded by Sw2 and processed by hosts H2, H3, and H4.

What action does the ARP process take when a host needs to build a frame, but the ARP cache does not contain an address mapping?

The ARP process sends out an ARP request to the Ethernet broadcast address to discover the MAC address of the destination device.

Host-B receives an ARP request. Host-B will return an ARP Reply if:

The IP address in the ARP request matches its own IP address.

Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

The client randomly selects a source port number.

A network administrator investigates a user problem. The user can reach hosts on the same network, but is unable to communicate to remote networks.The network administrator tries to ping the gateway address configured on the host device and is unsuccessful. What is the most likely cause of the problem?

The default gateway address is incorrect.

This layer connects independent local networks and controls the traffic flowing between them. It is responsible for ensuring that traffic between hosts on the local network stays local.

The distribution layer

What will happen if the default gateway address is incorrectly configured on a host?

The host cannot communicate with hosts in other networks.

Which statement describes the use of the ping command?

The ping command tests end-to-end connectivity between two devices.

Multiple choice question What is a function of the tracert command that differs from the ping command when they are used on a workstation?

The tracert command shows the information of routers in the path.

Which statement describes the treatment of ARP requests on the local link?

They are received and processed by every device on the local network.

What statement describes a characteristic of MAC addresses?

They are the physical address of the NIC or interface.

True or false? If Host-A has an IP packet to send to Host-B, and Host-A has determined that Host-B is on a different network. Host-A will encapsulate the IP packet in an Ethernet frame with the destination MAC address of the its default gateway. True or False

True

True or False: Network address translation (NAT) implemented on the home network router enables privately addressed devices to share a registered public IP address that can be routed over the internet.

True, Network address translation (NAT) implemented on the home network router enables privately addressed devices to share a registered public IP address that can be routed over the internet.

true of false: Placing all hosts on a single local network allows them to be seen by all other hosts. This is because there is one broadcast domain and hosts use ARP to find each other.

True, Placing all hosts on a single local network allows them to be seen by all other hosts. This is because there is one broadcast domain and hosts use ARP to find each other.

What is an advantage of UDP over TCP?

UDP communication requires less overhead.

Which type of applications are best suited to use UDP as the transport layer protocol?

UDP is a light-weight connectionless protocol that is well-suited for applications that are susceptible to delay or that do not need the features provided by TCP (guaranteed delivery, flow control, or sequencing).

What type of applications are best suited for using UDP?

UDP is not a connection-oriented protocol and does not provide retransmission, sequencing, or flow control mechanisms. It provides basic transport layer functions with a much lower overhead than TCP. Lower overhead makes UDP suitable for applications which are sensitive to delay.

An ARP request is sent out as:

a broadcast, so all devices on the same network will receive it

A PC user issues the netstat command without any options. What is displayed as the result of this command?

a list of all established active TCP connections

A default route is the interface through which the router forwards:

a packet containing a destination IP network address that is not in the routing table of the router

A home network is using NAT on the router connecting it to the internet. The PCs on the home network receive private IP addresses through DHCP. When a PC sends a packet to a web server on the internet, what is the source IP address in the packet header when it arrives at the web server?

a registered public IP address assigned to the external router interface

This is a networking device that connects multiple Layer 3, IP networks.

a router

Anytime the network portion of the IP addresses of the source and destination hosts do not match...

a router must be used to forward the message.

all the local networks within a LAN are under one administrative control. Other common characteristics of LANs are that they typically use Ethernet or wireless protocols, and they support high data rates.

all the local networks within a LAN are under one administrative control. Other common characteristics of LANs are that they typically use Ethernet or wireless protocols, and they support high data rates.

Which protocol is used by a computer to find the MAC address of the default gateway on an Ethernet network?

arp

What are two methods typically used on a mobile device to provide internet connectivity?

cellular and wifi

What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?

destination MAC address

When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?

destination ip address

A tourist is traveling through the countryside and needs to connect to the internet from a laptop. However, the laptop only has Wi-Fi and Ethernet connections. The tourist has a smartphone with 3G/4G connectivity. What can the tourist do to allow the laptop to connect to the internet?

enable tethering and create a hot spot

Which destination address is used in an ARP request frame?

ffff.ffff.ffff

what is used to create web pages

html

protocol commonly used by web browser

http

what is the secure protocol using port 443

https

Multiple choice question A computer has been assigned an IP address of 169.254.33.16. What command initiates the process of requesting a new IP address?

ipconfig/release

What is a disadvantage of deploying a peer-to-peer network model?

lack of centralized administration

A company is contemplating whether to use a client/server or a peer-to-peer network. What are three characteristics of a peer-to-peer network?

lacks centralized administration easy to create, less cost to implement

routers, like switches, are able to decode and read the messages that are sent to them. Unlike switches, which make their forwarding decision based on the Layer 2 MAC address, routers ......

make their forwarding decision based on the Layer 3 IP address.

Which wireless technology allows a customer to connect to a payment terminal in the store with a smartphone?

nfc

which ping command utility is used to resolve the address to the hostname.

ping -a

which ping command utility is used to continue pinging the target interface until manually stopped

ping -t

What protocol header information is used at the transport layer to identify a target application?

port number

Which three pieces of information are identified by a URL? (Choose three.)

protocol, domain, and location of resource

Which type of network model describes the functions that must be completed at a particular layer, but does not specify exactly how each protocol should work?

reference model

What is one function of the ARP protocol?

resolving an IPv4 address to a MAC address

This direct traffic and perform other functions critical to efficient network operation.

routers

What information is used by TCP to reassemble and reorder received segments?

sequence number

While a network security product is being deployed, a customizable list of allowable protocols is shown. Which three protocols should be allowed to provide for the use of email on a network? (

smtp, imap4, pop3

What information is added to the switch table from incoming frames?

source MAC address and incoming port number

What information does an Ethernet switch examine and use to build its address table?

source mac address

A host needs to reach another host on a remote network, but the ARP cache has no mapping entries. To what destination address will the host send an ARP request?

the broadcast MAC address

What is the result if the default gateway address is misconfigured on a PC?

the default gateway for a PC is the closest networking device that can forward traffic to other networks. If a PC has an incorrect or nonexistent default gateway address, it will not be able to communicate with devices in remote networks. However, communication would occur between devices in the same network with or without a default gateway.

A host will send a packet to the default gateway when:

the destination IP address is on a different network

What are two functions of MAC addresses in a LAN? (Choose two.)

to allow the transfer of frames from source to destination

A router forwards a packet to one of two places: a directly connected network containing the actual destination host, or...

to another router on the path to reach the destination host.

What is the purpose of using a source port number in a TCP communication?

to keep track of multiple conversations between devices

What is the purpose of ARP in an IPv4 network?

to obtain a specific MAC address when an IP address is known

A technician is troubleshooting a network where it is suspected that a defective node in the network path is causing packets to be dropped. The technician only has the IP address of the end point device and does not have any details of the intermediate devices. What command can the technician use to identify the faulty node?

tracert

A destination PC receives an email message with the sequence numbers on packets out of order. Which layer of the TCP/IP model is responsible for reassembling the packets of the message in the correct order?

transport

A student is sending files from a phone to a computer across a network. Which layer of the TCP/IP model is responsible for reassembling these messages as they are received on the computer?

transport

At which layer of the TCP/IP model does TCP operate?

transport

Broadcast does not go beyond routers, true or false?

true

Routers connect multiple networks, determine the best path to send packets, and forward packets based on a destination IP address., true or false

true

True or False: Every router contains a table of all locally connected networks and the interfaces that connect to them.

true

true or false Within a LAN, it is possible to place all hosts on a single local network or divide them up between multiple networks connected by a distribution layer device.

true, Within a LAN, it is possible to place all hosts on a single local network or divide them up between multiple networks connected by a distribution layer device.

True or False: If the destination network address is in the table, the router encapsulates the packet in a new frame in order to send it out. It forwards the new frame out of the interface associated with the path, to the destination network. The process of forwarding the packets toward their destination network is called routing.

true, If the destination network address is in the table, the router encapsulates the packet in a new frame in order to send it out. It forwards the new frame out of the interface associated with the path, to the destination network. The process of forwarding the packets toward their destination network is called routing.

True or false: The term local area network (LAN) refers to a local network, or a group of interconnected local networks that are under the same administrative control.

true, The term local area network (LAN) refers to a local network, or a group of interconnected local networks that are under the same administrative control.

true or false: There are two parts to an a network layer address, the network and host portions. Routers are not concerned about delivering packets to hosts. Routers are concerned with delivering packets to the network that a destination host is a member of.

true, There are two parts to an a network layer address, the network and host portions. Routers are not concerned about delivering packets to hosts. Routers are concerned with delivering packets to the network that a destination host is a member of.

true or false, When a client is initiating a request to open an FTP session, it does so by sending a packet to the FTP server with the destination port 21.

true, When a client is initiating a request to open an FTP session, it does so by sending a packet to the FTP server with the destination port 21.

true or false default gateway address is the address of the router interface connected to the same local network as the source host.

true, default gateway address is the address of the router interface connected to the same local network as the source host.

True or False: the definition of LAN has evolved to include interconnected local networks consisting of many hundreds of hosts, installed in multiple buildings and locations.

true, the definition of LAN has evolved to include interconnected local networks consisting of many hundreds of hosts, installed in multiple buildings and locations.

What requests a web page

web client

What hosts a web page?

web server

What type of port number is assigned by IANA to commonly used services and applications?

well-known port

When is UDP preferred to TCP?

when an application can tolerate some loss of data during transmission

A traveling sales representative uses a cell phone to interact with the home office and customers, track samples, make sales calls, log mileage, and upload/download data while at a hotel. Which internet connectivity method would be a preferred method to use on the mobile device due to the low cost?

wi fi

True or False When a router receives a frame, it decodes the frame to get to the packet containing the destination IP address.

yes, When a router receives a frame, it decodes the frame to get to the packet containing the destination IP address.