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Network Technology > Chapter 8-10 Questions > Flashcards

Chapter 8-10 Questions Flashcards

1
Q

What is the effect of using the Router# copy running-config startup-config command on a router?

The contents of flash will change.

The contents of ROM will change.

The contents of RAM will change.

The contents of NVRAM will change.

A

The contents of NVRAM will change.

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2
Q

What are two potential network problems that can result from ARP operation? (Choose two.)

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.

Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network.

On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.

Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing.

Multiple ARP replies result in the switch MAC address table containing entries that match the MAC addresses of hosts that are connected to the relevant switch port.

A

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.

Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network.

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3
Q

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

The host cannot communicate with other hosts in the local network.

A ping from the host to 127.0.0.1 would not be successful.

The host will have to use ARP to determine the correct address of the default gateway.

The host cannot communicate with hosts in other networks.

A

The host cannot communicate with hosts in other networks.

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4
Q

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

Power cycle the device.

Exit privileged EXEC mode and press Enter .

Enter CTRL-Z at the privileged mode prompt.

Exit global configuration mode.

Reboot the device.

A

Exit global configuration mode.

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5
Q

What are two functions of NVRAM? (Choose two.)

to contain the running configuration file

to store the startup configuration file

to retain contents when power is removed

to store the routing table

to store the ARP table

A

to store the startup configuration file

to retain contents when power is removed

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6
Q

What happens when the transport input ssh command is entered on the switch vty lines?

The switch requires remote connections via a proprietary client software.

The switch requires a username/password combination for remote access.

Communication between the switch and remote users is encrypted.

The SSH client on the switch is enabled.

A

Communication between the switch and remote users is encrypted.

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7
Q

Which two functions are primary functions of a router? (Choose two.)

microsegmentation

path selection

packet forwarding

domain name resolution

flow control

A

path selection

packet forwarding

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8
Q

The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?

The switch will have a management interface with the address 172.16.100.1.

The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1.

The switch can be remotely managed from a host on another network.

The switch can communicate with other hosts on the 172.16.100.0 network.

A

The switch can be remotely managed from a host on another network.

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9
Q

Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)

The frame has the broadcast address as the destination address.

The destination address is unknown to the switch.

The source address in the frame is a multicast address.

The destination address in the frame is a known unicast address.

The source address in the frame header is the broadcast address.

A

The frame has the broadcast address as the destination address.

The destination address is unknown to the switch.

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10
Q

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

source IP address

Ethernet type

destination IP address

destination MAC address

source MAC address

A

destination MAC address

source MAC address

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11
Q

What statement describes the function of the Address Resolution Protocol?

ARP is used to discover the MAC address of any host on a different network.

ARP is used to discover the IP address of any host on a different network.

ARP is used to discover the IP address of any host on the local network.

ARP is used to discover the MAC address of any host on the local network.

A

ARP is used to discover the MAC address of any host on the local network.

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12
Q

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

They must be forwarded by all routers on the local network.

They are dropped by all switches on the local network.

They are received and processed only by the target device.

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

A

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

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13
Q

Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?

routing table

ARP cache

MAC address table

neighbor table

A

ARP cache

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14
Q

Which two types of IPv6 messages are used in place of ARP for address resolution?

echo reply

neighbor advertisement

broadcast

echo request

neighbor solicitation

anycast

A

neighbor advertisement

neighbor solicitation

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15
Q

What property of ARP causes the NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?

Entries in an ARP table are time-stamped and are purged after the timeout expires.

The type field 0x806 appears in the header of the Ethernet frame.

The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.

The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.

A

The type field 0x806 appears in the header of the Ethernet frame.

INFO: When NICs receive frames, they inspect the type field in the Ethernet frame header. If it’s set to 0x806, it indicates that the frame contains ARP information, prompting the NIC to pass the data portion of the frame to the ARP process for further handling and resolution of IP addresses to MAC addresses.

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16
Q

Which term describes a field in the IPv4 packet header that contains a unicast, multicast, or broadcast address?

destination IPv4 address

TTL

protocol

header checksum

A

destination IPv4 address

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17
Q

Within a production network, what is the purpose of configuring a switch with a default gateway address?

Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination.

It provides a next-hop address for all traffic that flows through the switch.

A switch must have a default gateway to be accessible by Telnet and SSH.

The default gateway address is used to forward packets originating from the switch to remote networks.

A

The default gateway address is used to forward packets originating from the switch to remote networks.

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18
Q

When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?

Differentiated Services

Traffic Class

Next Header

Flow Label

A

Flow Label

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19
Q

How do hosts ensure that their packets are directed to the correct network destination?

They send a query packet to the default gateway asking for the best route.

They search in their own local routing table for a route to the network destination address and pass this information to the default gateway

They always direct their packets to the default gateway, which will be responsible for the packet delivery.

They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.​

A

They search in their own local routing table for a route to the network destination address and pass this information to the default gateway

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20
Q

Which statement describes a feature of the IP protocol?

IP encapsulation is modified based on network media.

IP relies on upper layer services to handle situations of missing or out-of-order packets.

MAC addresses are used during the IP packet encapsulation.

IP relies on Layer 2 protocols for transmission error control.

A

IP relies on upper layer services to handle situations of missing or out-of-order packets

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21
Q

What IPv4 header field identifies the upper layer protocol carried in the packet?

Version

Protocol

Differentiated Services

Identification

A

Protocol

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22
Q

What are two services provided by the OSI network layer? (Choose two.)

routing packets toward the destination

performing error detection

encapsulating PDUs from the transport layer

collision detection

placement of frames on the media

A

routing packets toward the destination

encapsulating PDUs from the transport layer

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23
Q

Why is NAT not needed in IPv6?​

The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers.​

Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.​

Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks.​

The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.

A

Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.​

24
Q

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

A

transport layer

25
Q

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

A

data link layer

26
Q

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

A

Fragmentation

27
Q

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

A

Connectionless

28
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

A

Destination ip address and source ip address

29
Q

Which statement is correct about IPv4 packet header fields?

A

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

30
Q

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

A

Header Checksum

31
Q

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

A

Protocol

32
Q

Which three options are major issues associated with IPv4?

A

IP address depletion, increased network complexity and internet routing table expansion, lack of end to end connectivity/

33
Q

Which two options are improvements provided by IPv6 as compared to IPv4?

A

Increases the IP address space, uses a simpler header to provide improved packet handling.

34
Q

Which is true of the IPv6 header?

A

It contains 0f 40 octets, it contains 8 header fields.

35
Q

Which is true of the IPv6 packet header?

A

The hop limit field replaces the Ipv4 time to live field.

36
Q

Which statement about host forwarding decisions is true?

A

local hosts can reach each other without the need of a router

37
Q

Which default gateway statement is true?

A

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

38
Q

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

A

Routeprint and netstat -r.

39
Q

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

A

Show ip route

40
Q

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

A

A route learned dynamically from OSPF.

41
Q

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

A

Default route

42
Q

Which is a characteristic of static routes?

A

They are manually configured.

43
Q

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

A

True

44
Q

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

A

netstat-r

45
Q

What information is added during encapsulation at OSI Layer 3?

A

Source and destination IP address

46
Q

How does the network layer use the MTU value?

A

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

47
Q

Which characteristic describes an IPv6 enhancement over IPv4?​

A

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

48
Q

Which statement accurately describes a characteristic of IPv4?

A

IPv4 has a 32-bit address space.

49
Q

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

A

Destination IP address.

50
Q

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

A

The packet will be sent directly to the destination host.

51
Q

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

A

127.0.0.1

52
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?

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.

53
Q

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

A

To relieve IPv4 address depletion.

54
Q

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

A

Destination IP address

55
Q

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

A

Destination address

56
Q

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

A

Hop limit.

57
Q
A

Network Technology (14 decks)

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