IST 220 Exam 3

At which layer or layers of the OSI model are TCP/IP standards primarily set?
A. Physical layer
B. Transport layer
C. Both physical layer and transport layer
D. Neither physical layer nor transport layer

B

Which of the following is one of the three parts of an IPv4 address?
A. Neither subnet part nor subnet mask
B. Subnet part
C. Both subnet part and subnet mask
D. Subnet mask

B

The total length of an IPv4 address is ________ bits.
A. 8
B. 32
C. 16
D. 64

B

In the IPv4 address 1.2.3.4, what is the network part?
A. We cannot say
B. 1.2
C. 1
D. 1.2.3

A

A border router connects different IP ________.
A. Neither subnets nor networks
B. Both subnets and networks
C. Networks
D. Subnets

C

An internal router connects different IP ________.
A. Neither subnets nor networks
B. Subnets
C. Networks
D. Both subnets and networks

B

A mask has ________ bits.
A. 32
B. 64
C. 8
D. 16

A

In a network mask, the 1s correspond to the ________.
A. Subnet part
B. Network part
C. Internet part
D. Host part

B

What do the 1s in a subnet mask represent?
A. Network and subnet part
B. Subnet part
C. Network part
D. Host part

A

In the mask 255.255.255.0, how many 1s are there?
A. 8
B. 16
C. 24
D. 48

C

In the mask /14, how many 1s are there?
A. 24
B. 8
C. 16
D. None of these

D

Express the mask /24 in dotted decimal notation.
A. 255.255.255.0
B. 255.0.0.0
C. 255.255.0.0
D. None of these

A

Express the mask /18 in dotted decimal notation.
A. None of these
B. 255.255.255.0
C. 255.255.0.0
D. 255.0.0.0

A

The Internet is organized in a ________.
A. Mesh
B. None of these
C. Ring
D. Hierarchy

A

In a routing table, a ________ represents a route for a group of IP addresses.
A. Metric
B. Schema
C. Column
D. Row

D

For 100,000 addresses, which will have fewer rows?
A. An Ethernet switching table
B. A routing table
C. Both will be about the same number of rows

B

In a routing table, Rows 47 and 3497 both match the destination IP address of an arriving packet's IP address. What row will the router look at first when trying to find matching rows?
A. The default row
B. 1
C. 47
D. 3497

B

The first step in the routing process involves ________.
A. Selecting an interface
B. Comparing the packet's destination IP address to matching rows
C. Comparing the packet's destination IP address to all rows
D. Selecting the best match row

C

The second step in the routing process involves ________.
A. Selecting an interface
B. Comparing the packet's destination IP address to all rows
C. Selecting the best-match row
D. Comparing the packet's destination IP address to matching rows

C

If any row other than the default row matches an IPv4 address, the router will ________.
A. Sometimes choose the default row
B. Impossible to determine
C. Always choose the default row
D. Never choose the default row

D

Which row will the router choose if all are matches?
A. 4400
B. 2
C. 2707
D. Impossible to determine

C

Row 2707 has the mask /16 and the metric 20. Row 4400 has the mask /16 and the metric 10. Which row will the router choose if both are matches?
A. 4400
B. The router will choose the default row
C. 2707
D. Either 2707 or 4400

A

Deciding what interface and to what device to send the packet back out is step ________ in the routing process.
A. 2
B. 3
C. None of these
D. 1

B

Router ports are called ________.
A. Interfaces
B. Sockets
C. Ports
D. Plugs

A

The next-hop router listed in the last row of a routing table with a network IP of 0.0.0.0 and a mask of 0.0.0.0 is the ________ router.
A. Best-match
B. Default
C. Socket
D. Local

B

If the next-hop router field in the best-match row says "local", the router should address the frame to the ________.
A. Destination host
B. Default router
C. None of these
D. Local router

A

If a router receives 20 packets in a row going to the same destination IP address, the standard calls for it to ________.
A. Use the decision it made for the first one
B. None of these
C. Go through all three steps for each
D. Send them via different routers to create load balancing

C

Which of the following allows packet fragmentation?
A. IPv4
B. Neither IPv4 nor IPv6
C. IPv6
D. Both IPv4 and IPv6

A

A router will discard a packet if the Time to Live (TTL) value in an arriving packet is ________.
A. 254
B. 0
C. 1
D. 256

C

In an IPv4 packet, the ________ field value tells the type of message contained in the IP packet's data field.
A. Protocol
B. Next-header
C. Data
D. Next-hop

A

The version of Internet Protocol that is growing rapidly is IP version ________.
A. 2
B. 4
C. None of these
D. 1

C

Which is a problem with IPv4 addresses?
A. We have run out of them
B. They are too complex
C. Routers find it difficult to handle them
D. They are incompatible with wireless devices

A

What is pushing IPv6 adoption now?
A. Pressure from the IETF
B. Pressure from ISPs
C. Pressure from ISO
D. None of these

D

For human reading, IPv6 addresses are written in ________ notation.
A. Binary
B. Hexadecimal
C. All of these
D. Dotted decimal

B

In IPv6 addresses, fields are separated by ________.
A. Dots
B. Dashes
C. Colons
D. Hashtags

C

If I simplify the address 2001:0000:0000:00fe:0000:0000:0000:cdef, I get ________.
A. 2001::fe:0:0:0:cdef
B. 2001:0:0:fe::cdef
C. 2001:0:0:fe:0:0:0:cdef
D. 2001::00fe:0::cdef

B

If I simplify the address 2001:0ed2:056b:00d3:00c0🔡0bcd:0fe0, I get ________.
A. Either 2001:ed2:56b:d3:c0🔡bcd:0fe0 or 2001:ed2:56b:d3:c🔡bcd:0fe
B. Neither 2001:ed2:56b:d3:c0🔡bcd:0fe0 nor 2001:ed2:56b:d3:c🔡bcd:0fe
C. 2001:ed2:56b:d3:c🔡bcd:0fe
D. 2001:ed2:56b:d3:c0🔡bcd:fe0

D

If I simplify the IPv6 address 2001:0000:0000:00fe:3270:0000:0000:cdef, I get ________.
A. 2001::00fe:3270::cdef
B. 2001:0:0:00fe:3270:0:0:cdef
C. 2001::fe:3270:0:0:cdef
D. 2001::00fe:3270:0:0:cdef

C

IPv6 uses ________ to know the packet length.
A. Header length fields
B. Hop limits
C. Total length fields
D. Payload lengths

D

In IPv6, the payload length gives the number of octets in the ________.
A. Entire packet minus the main and extension headers
B. Entire packet minus the main header
C. Entire packet
D. Entire packet minus the extension headers

B

The hop limit field in IPv6 corresponds to the ________ field in IPv4
A. None of these
B. Protocol
C. Length
D. Header checksum

A

Which of the following checks for errors using a checksum in the packet header?
A. Neither IPv4 nor IPv6
B. IPv4
C. IPv6
D. Both IPv4 and IPv6

B

Which has a better system for handling options beyond the main header?
A. Neither can handle options
B. Both use the same method
C. IPv4
D. IPv6

D

Sequence numbers are ________ bits long.
A. 32
B. 8
C. 16
D. 24

A

One-bit fields are called ________ fields.
A. Flag
B. SYN
C. ACK
D. None of these

A

TCP has ________ flag field(s).
A. 1
B. 9
C. 5
D. 2

B

If someone says that a 1-bit flag is not set, this means its value is ________.
A. 1
B. Blank
C. 0
D. We cannot say

C

A TCP ________ segment is a request to the other transport process to close a connection.
A. CLS
B. ACK
C. FIN
D. SYN

C

An abrupt close uses a ________ segment.
A. FIN
B. Neither FIN nor RST
C. RST
D. Either FIN or RST

C

Which of the following segments types is acknowledged?
A. RST
B. FIN
C. Neither FIN nor RST is acknowledged
D. Both of these are acknowledged

B

Which of the following can handle an application message that is one megabyte (1,048,576 bytes) in size?
A. TCP
B. UDP
C. Neither TCP nor UDP
D. Both TCP and UDP

A

If your subnet part is 8 bits long, you can have ________ subnets.
A. 64
B. 256
C. 128
D. 254

B

If your subnet part is 7 bits long, how many subnets can you have?
A. 256
B. 128
C. 512
D. None of these

B

In IP subnet planning, you need to have at least 130 subnets. How large should your subnet part be?
A. 7
B. None of these
C. 6
D. 8

D

Your firm has an 8-bit network part. If you need at least 200 subnets, what must your subnet part size be?
A. 6
B. 7
C. 5
D. 8

D

You have a 20-bit network part and a 4-bit subnet part. How many bits are left for the host part?
A. 6
B. 12
C. 8
D. 20

B

You have a 16-bit network part and a 4-bit subnet part. How many host bits will there be?
A. 16
B. 8
C. 12
D. 20

D

In specific IPv6 terminology, which is NOT one of the three parts of a public IPv6 unicast address?
A. Routing prefix
B. Subnet ID
C. Host part
D. All of these are parts in a public IPv6 unicast address

C

The routing prefix in IPv6 is like the ________ part in an IPv4 address.
A. Subnet
B. Network
C. Host
D. Both subnet and network

B

What field in an IPv6 global unicast address corresponds to the subnet part of an IPv4 address?
A. Interface ID
B. Subnet ID
C. Global routing prefix
D. None of these

B

If the subnet ID in an IPv6 address is 32 bits, how long is the routing prefix?
A. 16 bits
B. 64 bits
C. None of these
D. 32 bits

D

If your routing prefix is 16 bits, how long is your subnet ID?
A. 16 bits
B. 32 bits
C. Not possible to calculate
D. 48 bits

D

In an IPv6 global unicast address, the interface ID is ________ bits long.
A. Its size varies
B. 64
C. 16
D. 8

B

The IEEE calls a 64-bit interface address that it designed a(n) ________ address.
A. MAC address
B. IP address
C. Interface ID
D. Extended Unique Identifier-64

D

A step in creating an EUI-64 is dividing a 48-bit MAC address in half and inserting ________ in the center.
A. The interface ID
B. 0000
C. FFFE
D. The subnet ID

C

Convert the following EUI-48 address to a modified EUI-64 address: AA-00-00-FF-FF-00.
A. A800:ff:feff:ff00
B. AA00:ff:feff:ff00
C. AA00:00ff:feff:ff00
D. A800:00ff:feff:ff00

D

NAT ________.
A. Allows a firm to have more internal IP addresses
B. Neither allows a firm to have more internal IP addresses nor provides some security
C. Provides some security
D. Both allows a firm to have more internal IP addresses and provides some security

D

NAT enhances security by ________.
A. Both preventing sniffers from learning internal IP addresses and encryption
B. Encryption
C. Preventing sniffers from learning internal IP addresses
D. Neither preventing sniffers from learning internal IP addresses nor encryption

C

Which of the following is a private IP address range?
A. Both 10.x.x.x and 128.171.x.x
B. 10.x.x.x
C. 128.171.x.x
D. Neither 10.x.x.x nor 128.171.x.x

B

For an internal client to use NAT to communicate with an external webserver, the client must be configured to do so.
A. False
B. True

A

If your local DNS server does not know the host name of an IP address, it will get the address from a(n) ________.
A. Proxy DNS server
B. None of these
C. Root DNS server
D. Authoritative DNS server

D

If the local DNS server does not know an IP address and must contact a remote DNS server, which DNS server will return the response to the client?
A. The local DNS server
B. Either the local DNS server or the remote DNS server
C. The remote DNS server
D. No IP address will be returned to the client

A

The domain name system ________.
A. Is a general naming system for the Internet
B. Both is a way to find a host's IP addresses if your computer only knows the host's host name and is a general naming system for the Internet
C. Neither is a way to find a host's IP addresses if your computer only knows the host's host name nor is a general naming system for the Internet
D. Is a way to find a host's IP addresses if your computer only knows the host's host name

B

In DNS, a group of resources under the control of an organization is called a ________.
A. Network
B. Domain
C. Subnet
D. Scope

B

“.com” is a ________.
A. Top-level domain
B. None of these
C. Root domain
D. Second-level domain

A

Corporations wish to have ________ domain names.
A. Third-level
B. None of these
C. Top-level
D. Second-level

D

The highest-level DNS servers are called ________.
A. Root servers
B. Top-level domain servers
C. Neither root servers nor top-level domain servers
D. Both root servers and top-level domain servers

A

Companies get second-level domains from ________.
A. The Internet Society
B. The United States Government
C. Domain registrars
D. The IETF

C

The DNS ________ record is for the host name’s ________ address.
A. A; IPv4
B. AAAA; IPv4
C. A; IPv6
D. None of these

A

The DNS ________ record is for the host name’s ________ address.
A. AAAA; IPv4
B. AAAA; IPv6
C. Both AAAA; IPv4 and AAAA; IPv6
D. Neither AAAA; IPv4 nor AAAA; IPv6

B

________ is an interior dynamic routing protocol.
A. Neither OSPF nor BGP
B. OSPF
C. BGP
D. Both OSPF and BGP

B

A company is free to select whatever ________ dynamic routing protocol it wishes.
A. Interior
B. Both interior and exterior
C. Exterior
D. Neither interior nor exterior

A

The almost-universal exterior dynamic routing protocol is ________.
A. Neither EIGRP nor OSPF
B. OSPF
C. Both EIGRP and OSPF
D. EIGRP

A

ICMP is used for ________.
A. None of these
B. Routing messages
C. Error messages
D. Allocating dynamic IP addresses

C

Pinging is to send ICMP ________ messages to the target host.
A. Echo
B. Echo request
C. Ping
D. Error advisement

B