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Networking Revamped > Module 8 - Network Layer > Flashcards

Module 8 - Network Layer Flashcards

1
Q

Which OSI layer sends segments to be encapsulated in an IPv4 or IPv6 packet?

data link layer
network layer
transport layer
session layer

A

transport layer

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2
Q

Which layer is responsible for taking an IP packet and preparing it for transmission over the communications medium?

physical layer
network layer
data link layer
transport layer

A

data link layer

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2
Q

What is the term for splitting up an IP packet when forwarding it from one medium to another medium with a smaller MTU?

encapsulation
fragmentation
segmentation
serialization

A

fragmentation

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2
Q

Which delivery method does not guarantee that the packet will be delivered fully without errors?

connectionless
best effort
media independent

A

best effort

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3
Q

What are the two most commonly referenced fields in an IPv4 packet header that indicate where the packet is coming from and where it is going? (Choose two.)

destination IP address
protocol
Time to Live
source IP address
Differentiated Services (DS)

A
  • destination IP address
  • source IP address
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3
Q

Which statement is correct about IPv4 packet header fields?

The source and destination IPv4 addresses remain the same while travelling from source to destination.
The Time to Live field is used to determine the priority of each packet.
The Total Length and Header Checksum fields are used to reorder a fragmented packet.
The Version field identifies the next level protocol.

A

The source and destination IPv4 addresses remain the same while travelling from source to destination.

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3
Q

Which field includes common values such as ICMP (1), TCP (6), and UDP (17)?

Header Checksum
Time to Live
Protocol
Differentiated Services (DS)

A

Protocol

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3
Q

Which field is used to detect corruption in the IPv4 header?

Header Checksum
Time to Live
Protocol
Differentiated Services (DS)

A

Header Checksum

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4
Q

Which three options are major issues associated with IPv4? (Choose three.)

IP address depletion
increased network complexity and Internet routing table expansion
always on connections
lack of end-to-end connectivity
global and political boundaries
too many IPv4 addresses available

A
  • IP address depletion
  • increased network complexity and Internet routing table expansion
  • lack of end-to-end connectivity
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4
Q

Which two options are improvements provided by IPv6 as compared to IPv4? (Choose two.)

header supports additional fields for complex packets
increased the IP address space
standardizes the use of NAT
supports class-based networks
uses a simpler header to provide improved packet handling

A
  • increased the IP address space
  • uses a simpler header to provide improved packet handling
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5
Q

Which is true of the IPv6 header?

it consists of 20 octets.
it consists of 40 octets.
it contains 8 header fields.
it contains 12 header fields.

A
  • it consists of 40 octets.
  • it contains 8 header fields.
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6
Q

Which is true of the IPv6 packet header?

The Hop Limit field replaces the IPv4 Time to Live field.
The Source and Destination IPv6 addresses change while travelling from source to destination.
The Time to Live field replaces the DiffServ field.
The Version field identifies the next header.

A

The Hop Limit field replaces the IPv4 Time to Live field.

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6
Q

Which statement about host forwarding decisions is true?

A host cannot ping itself.
A remote destination host is on the same local network as the sending host.
Local hosts can reach each other without the need of a router.
Routing is enabled on switches to discover the best path to a destination.

A

Local hosts can reach each other without the need of a router.

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7
Q

Which default gateway statement is true?

A default gateway is required to send packets to other hosts on the local network.
The default gateway address is the IP address of a switch on a remote network.
The default gateway address is the IP address of the router on the local network.
Traffic can only be forwarded outside the local network if there is no default gateway.

A

The default gateway address is the IP address of the router on the local network.

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7
Q

Which two commands could be entered on a Windows host to view its IPv4 and IPv6 routing table? (Choose two.)

netroute -l
netstat -r
print route
route print
print net

A

netstat -r
route print

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8
Q

What is the command used on a Cisco IOS router to view the routing table?

netstart -r
route print
show ip route
show routing table

A

show ip route

9
Q

This type of route is also known as a gateway of last resort.

static route
remote route
default route
directly connected route

A

default route

9
Q

What does a code of “O” indicate next to a route in the routing table?

a directly connected route
a route with an administrative distance of 0
a gateway of last resort
a route learned dynamically from OSPF

A

a route learned dynamically from OSPF

10
Q

Which is a characteristic of static routes?

They are manually configured.
They are advertised to directly connected neighbors.
They are appropriate when there are many redundant links.
They automatically adjust to a change in network topology.

A

They are manually configured.

10
Q

True or False? A router can be configured with a combination of both static routes and a dynamic routing protocol.

True
False

A

True

11
Q

Which command can be used on a Windows host to display the routing table?

netstat -s
show ip route
netstat -r
tracert

A

netstat -r

12
Q

What information is added during encapsulation at OSI Layer 3?

source and destination MAC
source and destination application protocol
source and destination port number
source and destination IP address

A

source and destination IP address

13
Q

How does the network layer use the MTU value?

The network layer depends on the higher level layers to determine the MTU.
The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it.
The MTU is passed to the network layer by the data link layer.
To increase speed of delivery, the network layer ignores the MTU.

A

The MTU is passed to the network layer by the data link layer.

14
Q

Which characteristic describes an IPv6 enhancement over IPv4?​

IPv6 addresses are based on 128-bit flat addressing as opposed to IPv4 which is based on 32-bit hierarchical addressing.
The IPv6 header is simpler than the IPv4 header is, which improves packet handling.
Both IPv4 and IPv6 support authentication, but only IPv6 supports privacy capabilities.
The IPv6 address space is four times bigger than the IPv4 address space.

A

The IPv6 header is simpler than the IPv4 header is, which improves packet handling.

15
Q

When a connectionless protocol is in use at a lower layer of the OSI model, how is missing data detected and retransmitted if necessary?

Connectionless acknowledgements are used to request retransmission.
Upper-layer connection-oriented protocols keep track of the data received and can request retransmission from the upper-level protocols on the sending host.
Network layer IP protocols manage the communication sessions if connection-oriented transport services are not available.
The best-effort delivery process guarantees that all packets that are sent are received.

A

Upper-layer connection-oriented protocols keep track of the data received and can request retransmission from the upper-level protocols on the sending host.

16
Q

What was the reason for the creation and implementation of IPv6?

to make reading a 32-bit address easier
to relieve IPv4 address depletion
to provide more address space in the Internet Names Registry
to allow NAT support for private addressing

A

to relieve IPv4 address depletion

17
Q

Which statement accurately describes a characteristic of IPv4?

All IPv4 addresses are assignable to hosts.
IPv4 has a 32-bit address space.
An IPv4 header has fewer fields than an IPv6 header has.
IPv4 natively supports IPsec.

A

IPv4 has a 32-bit address space.

17
Q

Which field in an IPv4 packet header will typically stay the same during its transmission?

Flag
Time-to-Live
Packet Length
Destination Address

A

Destination Address

17
Q

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

destination MAC address
source IP address
destination IP address
source MAC address

A

destination IP address

18
Q

Which field in an IPv6 packet is used by the router to determine if a packet has expired and should be dropped?

TTL
Hop Limit
Address Unreachable
No Route to Destination

A

Hop Limit

19
Q

Which information is used by routers to forward a data packet toward its destination?

source IP address
destination IP address
source data-link address
destination data-link address

A

destination IP address

19
Q

A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?

The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.
The packet will be sent directly to the destination host.
The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.
The packet will be sent only to the default gateway.

A

The packet will be sent directly to the destination host.

20
Q

A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?

route the packet out the Gigabit 0/1 interface
create a new Layer 2 Ethernet frame to be sent to the destination
look into the ARP cache to determine the destination IP address
look into the routing table to determine if the destination network is in the routing table

A

create a new Layer 2 Ethernet frame to be sent to the destination

21
Q

Which IPv4 address can a host use to ping the loopback interface?

126.0.0.1
127.0.0.0
126.0.0.0
127.0.0.1

A

127.0.0.1

Networking Revamped (15 decks)

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