Final Exam ITN 154 Questions

What is one main characteristic of the data link layer?

It shields the upper layer protocol from being aware of the physical medium to be used in the communication.

What are two functions that are provided by the network layer?

directing data packets to destination hosts on other networks providing end devices with a unique network identifier

The new LAN must support 90 connected devices. What is the smallest network mask that the network administrator can use for the new network?

128

IMAP Port Number

143

The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?

192

The new LAN must support 200 connected devices. What is the smallest network mask that the network administrator can use for the new network?

0

Which functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?

1. places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame 2. implements trailer with frame check sequence for error detection 3. integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper 4. implements CSMA/CD over legacy shared half-duplex media 5.applies source and destination MAC addresses to Ethernet frame

FTP Port Number

21

SSH port number

22

The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?

224

The new LAN must support 10 connected devices. What is the smallest network mask that the network administrator can use for the new network?

240

The new LAN must support 4 connected devices. What is the smallest network mask that the network administrator can use for the new network?

248

DHCP Port Number

67

TFTP Port Number

69

Which two statements describe features of an IPv4 routing table on a router

Directly connected interfaces will have two route source codes in the routing table: C and S. If a default static route is configured in the router, an entry will be included in the routing table with source code S.

A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?

It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.

What service is provided by BOOTP?

Legacy application that enables a diskless workstation to discover its own IP address and find a BOOTP server on the network.

What attribute of a NIC would place it at the data link layer of the OSI model?

MAC Address

Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network?

NAT introduces problems for some applications that require end-to-end connectivity. NAT provides a solution to slow down the IPv4 address depletion.

What are two ICMPv6 messages that are not present in ICMP for IPv4?

Neighbor Solicitation and Router Advertisment

What are two problems that can be caused by a large number of ARP request and reply messages?

The ARP request is sent as a broadcast, and will flood the entire subnet. All ARP request messages must be processed by all nodes on the local network.

What characteristic describes an IPS?

a network device that filters access and traffic coming into a network

What are two primary responsibilities of the Ethernet MAC sublayer?

accessing the media data encapsulation

What two ICMPv6 message types must be permitted through IPv6 access control lists to allow resolution of Layer 3 addresses to Layer 2 MAC addresses?

neighbor solicitations and neighbor advertisements

What are two characteristics shared by TCP and UDP?

port numbering and use of checksum

What is a function of the data link layer?

provides for the exchange of frames over a common local media

When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached?

store-and-forward

During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?

switch the packet to the directly connected interface

A user sends an HTTP request to a web server on a remote network. During encapsulation for this request, what information is added to the address field of a frame to indicate the destination?

the MAC address of the default gateway

Users report that the network access is slow. After questioning the employees, the network administrator learned that one employee downloaded a third-party scanning program for the printer. What type of malware might be introduced that causes slow performance of the network?

worm