Module 8 - Network Layer Flashcards
Which OSI layer sends segments to be encapsulated in an IPv4 or IPv6 packet?
data link layer
network layer
transport layer
session layer
transport layer
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
data link layer
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
fragmentation
Which delivery method does not guarantee that the packet will be delivered fully without errors?
connectionless
best effort
media independent
best effort
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)
- destination IP address
- source IP address
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.
The source and destination IPv4 addresses remain the same while travelling from source to destination.
Which field includes common values such as ICMP (1), TCP (6), and UDP (17)?
Header Checksum
Time to Live
Protocol
Differentiated Services (DS)
Protocol
Which field is used to detect corruption in the IPv4 header?
Header Checksum
Time to Live
Protocol
Differentiated Services (DS)
Header Checksum
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
- IP address depletion
- increased network complexity and Internet routing table expansion
- lack of end-to-end connectivity
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
- increased the IP address space
- uses a simpler header to provide improved packet handling
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.
- it consists of 40 octets.
- it contains 8 header fields.
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.
The Hop Limit field replaces the IPv4 Time to Live field.
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.
Local hosts can reach each other without the need of a router.
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.
The default gateway address is the IP address of the router on the local network.
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
netstat -r
route print
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
show ip route
This type of route is also known as a gateway of last resort.
static route
remote route
default route
directly connected route
default route
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 route learned dynamically from OSPF
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.
They are manually configured.
True or False? A router can be configured with a combination of both static routes and a dynamic routing protocol.
True
False
True
Which command can be used on a Windows host to display the routing table?
netstat -s
show ip route
netstat -r
tracert
netstat -r
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
source and destination IP address
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.
The MTU is passed to the network layer by the data link layer.
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.
The IPv6 header is simpler than the IPv4 header is, which improves packet handling.
