Networking Essentials Final Study
192.168.1.0/24 is subnetted and every subnet is /28. Which of the following is a valid subnet address?
192.168.1.176
Your company has a policy to use the first IP address in a network as the default gateway address. A new server has IP address 192.168.184.227 and subnet mask 255.255.255.248. What should be the default gateway for this server?
192.168.184.225
Which of the following is a valid IPv6 address?
2001:0:130F::9C0:876A:130B
What is the purpose of cladding in fiber optic cables?
reduces light loss
During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?
the next byte that the destination expects to receive
Fiber-optic
Has the best immunity to electrical noise.
Given the IP address 187.10.5.135/26, what is the last usable IP address in the subnet?
187.10.5.190
What subnet mask provides the fewest wasted addresses for a subnet with 27 hosts?
/27
How many host addresses are available on a /22 network?
1022
If 148.10.0.0/16 is subnetted, and all subnets have the same mask of 255.255.254.0, how many subnets can be created?
128
If you subnet 142.120.0.0/16 to create 512 equal-sized subnets, what is the subnet address for the third subnet?
142.120.1.0
What is the maximum size of the payload field in an Ethernet frame?
1500 bytes
What is the network address for a host that has IP address 172.16.140.24 and Subnet Mask 255.255.192.0?
172.16.128.0/18
Which of the following is the broadcast address for 172.16.0.0/22?
172.16.3.255
Which subnet mask would produce a subnet with up to 30 host addresses?
255.255.255.224
How many bits are in an IPv4 address ?
32
How many bits are in an Ethernet MAC address?
48
Which of the following is an IPv6 loopback address?
::1
Why will a broadcast MAC address never be leaned by a switch and placed in the MAC Address Table ?
A broadcast address will never be a source address.
Host A needs to learn the Ethernet MAC address of Host B, which is on the same network. What protocol provides this information?
ARP
Activities that corresponds with what layer of the OSI model."Bit transmission and reception."
Physical Layer
What is the difference between an IP address and a MAC address?
An IP address is a Layer 3 logical address and a MAC address is a Layer 2 physical address.
What cable characteristic is also referred to as Loss ?
Attenuation
What header field is used by ICMPv6 to determine that how far a packet can travel?
Hop Limit field
PDU names with the corresponding layer of the OSI model. "Physical Layer"
Bits
MAC addresses to the type of address. "FF-FF-FF-FF-FF-FF"
Broadcast
What IPv4 address type has all host bits = 1?
Broadcast address.
What is the minimum cable category required for a link running at 4Gbps?
Cat 6a
What class is the IPv4 address 122.11.1.244?
Class A
End Devices - that originate or terminate data flow
Computer, laptop, drawing table
Which protocol translates a website name such as www.sait.ca into a network address?
DNS
Activities that corresponds with what layer of the OSI model. "Forwards frames."
Data Link Layer
Which of the following is an IPv6 Link-Local address created using the EUI-64 format if the device MAC address is D4:8C:B5:CE:A0:C1?
FE80::D68C:B5FF:FECE:A0C1
Cut-through
Forwards the frame before it is fully received
Layer 2 Protocol Data Unit (PDU)
Frame
PDU names with the corresponding layer of the OSI model. "Data Link Layer"
Frames
For the global unicast IPv6 address: 2001:DB8:ACAD:A::1/64 What are the global routing prefix, subnet ID, and interface ID ?
Global routing prefix is 2001:DB8:ACAD Subnet ID is 000A Interface ID is 0000:0000:0000:1
What family of protocols apply to wireless Access Points?
IEEE 802.11
Which of the following is a connectionless network layer protocol?
IP
purpose of the Ethernet Type/Length field?
Indicates the network layer protocol used
UTP
Is currently the most common network media.
What is the purpose of the subnet mask?
It allows a host to determine which bits in its IPv4 address belong to the network.
Consider the following routing table entry for R1: O 10.1.1.0/24 [120/12] via 209.165.200.226, 00:00:05, Serial0/0/0 What is the significance of the Serial0/0/0?
It is the interface on R1 used to send data that is destined for 10.1.1.0/24.
How does a host on a network in Calgary determine what destination MAC address to use to reach a host on a different network in Toronto?
It will use the MAC address of its default gateway.
PDU names with the corresponding layer of the OSI model. "Network Layer"
Packets
LANs
LANs primarily use Ethernet
Which of the following statements about Layered Models is true?
Layered Models reduce complexity and isolate problems.
MAC addresses to the type of address. "01-00-5E-4D-62-B1"
Multicast
What type of fiber optic cable would be appropriate to connect equipment in a single room?
Multimode
The Physical and Data Link layers of the OSI model correspond to which layer of the TCP/IP model?
Network Access
Activities that corresponds with what layer of the OSI model. "Determines the best path for packets."
Network Layer
Open and Proprietary Standards?
Open standards allow different manufacturers to make equipment that will all work together.
fields from this Ethernet Frame
Preamble, Destination Address, SA, Type Length Field, Data, FCS
JPEG , GIF, and MPEG would all be examples of formats developed for what layer of the OSI ?
Presentation
What is the purpose of the passive-interface command?
Prevents routing updates from being sent out the specified interface.
What type of connector is most commonly used with UTP network cables?
RJ-45
Intermediary Devices - that manage data flow
Router, switches, hubs
Which two statements correctly describe the concepts of administrative distance and metric?
Routes with the smallest metric to a destination indicate the best path Administrative distance refers to the trustworthiness of a particular route.
PDU names with the corresponding layer of the OSI model. "Transport Layer"
Segments
If the Default Gateway is configured incorrectly on a host, what is the impact on communications?
The host can communicate with other hosts on the local network, but is unable to communicate with other hosts on remote networks.
jacket colors of fiber-optic cables?
Single-mode cables should have a yellow colored jacket and multi-mode cables should have an orange or blue colored jacket.
Store and Forward
Stores complete frame before sent
Fragment Free
Stores first 64 bytes before forwarding
What termination standards on each end of a UTP cable would result in a Straight Through cable?
T568B, T568B
Which characteristic describes an IPv6 enhancement over IPv4?
The IPv6 header is simpler than the IPv4 header, which improves packet handling
An OSPF enabled router is processing learned routes to select best paths to reach
The cumulative bandwidth that is used along the routing path.
What part of the MAC address 00-0E-7B-45-90-E6 identifies the manufacturer?
The first 3 bytes 00-0E-7B indicate the manufacturer
two of the following are true about IPv6?
The first 64 bits represent the dynamically created interface ID. A single interface may be assigned multiple IPv6 addresses of any type.
What address does an IPv6 host use to reach all other hosts on the network?
The multicast address FF02::1.
Encapsulation
The process of adding control and addressing information to the data as it moves down the layers.
Multiple connections to a web server from the same client are tracked using what method ?
The source port number of the connection from the client.
Destination: FFFF.FFFF.FFFF Source:000A.7835.B412 Destination:172.16.31.1 Source:172.16.31.2 A switch receives the above frame from Host A and the MAC table is fully populated (all hosts are known). Which of the following best describes what the switch does?
The switch will flood this frame out all active ports except the port on which it received the frame.
What happens to packets if they cannot be delivered using IP?
They are dropped, it is the job of the upper layer protocols to manage lost data.
Two characteristics of 802.11 wireless networks?
They use CSMA/CD technology. They use CSMA/CA technology. They are collision-free networks.
What is the purpose of the Protocol field in the IP header ?
To identify the Transport layer protocol in its payload.
Activities that corresponds with what layer of the OSI model. "Responsible for the delivery of segments."
Transport
MAC addresses to the type of address. "08-00-27-00-D0-4B"
Unicast
Coaxial
Used to attach antennas to wireless devices.
WANs
WANs use many different technologies