Deck 8: Tcpip Internetworking I

Question 1

________ operates at the internet layer.

A)TCP
B)IP
C)Both A and B
D)Neither A nor B

Answer 1

B

Question 2

When a router forwards incoming packets closer to their destination hosts,this is ________.

A)routing
B)switching
C)bridging
D)hopping

Answer 2

A

Question 3

In a network mask,the 1s correspond to the ________.

A)network part
B)subnet part
C)host part
D)none of the above

Answer 3

A

Question 4

________ operates at the transport layer.

A)TCP
B)UDP
C)Both A and B
D)Neither A nor B

Question 5

UDP is ________.

A)connection-oriented
B)connectionless
C)both A and B
D)neither A nor B

Question 6

Which of the following is reliable?

A)TCP
B)IP
C)both A and B
D)neither A nor B

Question 7

The total length of an IPv4 address is ________ bits.

A)8
B)16
C)32
D)We cannot say.

Question 8

A mask has ________ bits.

A)8
B)16
C)32
D)We cannot say.

Question 9

Which of the following is connectionless?

A)TCP
B)IP
C)both A and B
D)neither A nor B

Question 10

Which of the following is reliable?

A)TCP
B)UDP
C)both A and B
D)neither A nor B

Question 11

TCP is ________.

A)connectionless
B)unreliable
C)both A and B
D)neither A nor B

Question 12

In the IPv4 address 1.2.3.4,what is the network part?

A)1
B)1)2
C)1)3
D)We cannot say.

Question 13

An internal router only connects different IP ________.

A)subnets
B)networks
C)both A and B
D)neither A nor B

Question 14

Which of the following is connectionless?

A)TCP
B)UDP
C)both A and B
D)neither A nor B

Question 15

Border router's main job is to connect different subnets in the same network.

Question 16

In a network mask,the 1s correspond to the ________.

A)network part
B)subnet part
C)host part
D)none of the above

Question 17

UDP is reliable.

Question 18

Which of the following is one of the three parts of an IPv4 address?

A)subnet part
B)mask
C)both A and B
D)neither A nor B

Question 19

TCP is reliable.

Question 20

The network part of an IPv4 address is ________ bits long.

A)8
B)16
C)32
D)We cannot say.

Question 21

The default row ________.

A)always has the mask /32
B)will always match the IP address of an incoming packet
C)both A and B
D)neither A nor B

Question 22

A row in a routing table has the destination 10.8.0.0 and the mask /24.It is a match for 10.8.6.7.

Question 23

For a given volume of traffic,which are more expensive?

A)switches
B)routers
C)Both of the above are about equally expensive.

Question 24

Deciding how to send the packet back out is Step ________ in the routing process.

A)1
B)2
C)3
D)4

Question 25

In the mask 255.255.255.0,how many 1s are there?

A)8
B)16
C)24
D)none of the above

Question 26

Routers know the difference between network and subnet masks.

Question 27

Row 2707 has the mask /16 and the cost metric 20.Row 4400 has the mask /16 and the cost metric 10.Which row will the router choose if both are matches?

A)2707
B)4400
C)either A or B
D)The router will choose the default row.

Question 28

Routers usually are connected in a ________ topology.

A)point-to-point
B)mesh
C)hierarchical
D)bus

Question 29

The default row will never be selected as the best match row.

Question 30

A(n)________ must find the best-matching row in its ________ table by comparing several row matches.

A)ethernet switch, switching
B)router, routing
C)both A and B
D)neither A nor B

Question 31

In a routing table,a row is a route for a single IP address.

Question 32

In a routing table,Rows 47,3,497,and 30,451 match the destination IP address of an arriving packet's IP address.Which row will the router look at last when trying to find matches?

A)1
B)37
C)30,451
D)the default row

Question 33

The first Step in the Routing process involves ________.

A)selecting the best match row
B)comparing the packet's destination IP address to all rows
C)comparing the packet's destination IP address to matching rows
D)selecting an interface

Question 34

In a routing table,Rows 47,3,497,and 30,451 match the destination IP address of an arriving packet's IP address.Which row will the router look at first when trying to find matches?

A)1
B)47
C)30,451
D)the default row

Question 35

When a packet arrives,the router should look for matches in ALL rows in the routing table.

Question 36

For 100,000 addresses,which will have fewer rows?

A)router table
B)ethernet switch table
C)Both will be about the same length.

Question 37

There is a row for each address in a(n)________.

A)router table
B)ethernet switch table
C)both of the above
D)neither A nor B

Question 38

Row 2707 has the mask /16 and the reliability metric 20.Row 4400 has the mask /14 and the reliability metric 10.Which row will the router choose if both are matches?

A)2707
B)4400
C)either A or B
D)The router will choose the default row.

Question 39

When a network mask is applied to any IP address on the network,the result is the IP address' network part followed by zeros.

Question 40

In the mask /14,how many 1s are there?

A)8
B)16
C)24
D)none of the above

Question 41

The use of options in IP is ________.

A)very common
B)suspicious because they are often used by hackers
C)both A and B
D)neither A nor B

Question 42

In packet fragmentation and reassembly,the ________ field is used.

A)version
B)identification
C)protocol
D)Diff-Serv

Question 43

Routers send packets out ________.

A)ports
B)connections
C)interfaces
D)plugs

Question 44

A router has to go through the ARP process each time it needs to send a packet to a destination host or to a next-hop router.

Question 45

A router will discard a packet if the TTL value reaches ________.

A)0
B)1
C)254
D)256

Question 46

According to the IETF standards,if a router receives a series of packets from the same IP address to the same IP address,it should ________.

A)go through the entire process for each packet
B)cache the decision made for the first packet and use this decision on subsequent packets
C)skip the first step in the routing process but go through other steps for each subsequent packet
D)none of the above

Question 47

Which of the following is contributing to the exhaustion of IPv4 addresses?

A)the growing number of hosts in Asia
B)the growing number of mobile devices
C)both A and B
D)neither A nor B

Question 48

To deliver an arriving packet to a destination host on a subnet connected to a router,the router needs to know the destination host's ________ before the router can send the packet on to the destination host.

A)IP address
B)data link layer address
C)both A and B
D)neither A nor B

Question 49

What does a router do with ARP request messages?

A)It broadcasts them.
B)It sends them directly to the destination host.
C)both A and B
D)neither A nor B

Question 50

The router selects a row in which the next-hop router is labeled local.The router will send the packet to the ________.

A)default router
B)local next-hop router
C)the local host
D)the destination host

Question 51

Fragmentation is ________.

A)very common
B)suspicious because it is often used by hackers
C)both A and B
D)neither A nor B

Question 52

The main version of Internet Protocol in use today is IP version ________.

A)1
B)4
C)5
D)6

Question 53

An IPv4 packet's protocol field value is 1.The data field contains a(n)________ message.

A)TCP
B)UDP
C)ICMP
D)DNS

Question 54

In an IPv4 packet,the ________ field value tells the type of message contained in the IP packet's data field.

A)data
B)next-hop
C)next-header
D)protocol

Question 55

A router must use the ARP process ________.

A)when a new router comes online
B)when a router goes offline
C)whenever it forwards an IP packet
D)whenever it forwards an IP packet to a host that is not in its ARP cache

Question 56

Compared to normal routing,decision caching is ________.

A)faster
B)less dangerous
C)both A and B

Question 57

The main benefit of IPv6 over IPv4 is ________.

A)two more bits in the IP address
B)two more bytes in the IP address
C)the ability to have quality-of-service guarantees
D)the ability to support more possible hosts

Question 58

The next-hop router in the default row is called the default router.

Question 59

ARP is used to find the destination data link layer destination addresses of ________.

A)destination hosts
B)routers
C)both A and B
D)neither A nor B

Question 60

The new version of Internet Protocol that is coming into use is IP version ________.

A)1
B)4
C)5
D)6

Question 61

For human reading,in IPv6 addresses,letters should be written in ________.

A)uppercase
B)lowercase
C)both A and B
D)neither A nor B

Question 62

To handle internetwork transmission control tasks that the IP protocol cannot handle,the IETF created TCP.

Question 63

For human reading,symbols in IPv6 addresses are written in groups of ________.

A)1
B)2
C)4
D)16

Question 64

The time to live field in IPv4 has the same basic function as the hop limit field in IPv6.

Question 65

The encapsulating security protocol can be used in ________.

A)IPv4
B)IPv6
C)both A and B
D)neither A nor B

Question 66

Which of the following permits fragmentation by routers along a packet's route?

A)IPv4
B)IPv6
C)both A and B
D)neither A nor B

Question 67

One-bit fields are called ________ fields.

A)SYN
B)flag
C)ACK
D)none of the above

Question 68

The version number field in IPv6 has the value ________.

A)0001
B)0100
C)0101
D)none of the above

Question 69

If the ACK bit is set,the acknowledgment number field MUST have a value.

Question 70

For human reading,IPv6 address are written in ________.

A)decimal
B)hexadecimal
C)binary
D)Elvish

Question 71

A TCP ________ segment is a request to close a connection.

A)FIN
B)ACK
C)Close
D)Disconnect

Question 72

If the sending host does not do MTU discovery,the largest packet it can send is ________.

A)1,280 octets
B)65,536 octets
C)65,536 octets minus the 40 octets of the main headers
D)None of the above. The sending host must do MTU discovery.

Question 73

If I simplify the address 2001:0000:0000:00fe:0000:0000:0000:cdef,I get ________.

A)2001:0000:0000:00fe::::cdef
B)2001:::00fe:0000:0000:0000:cdef
C)2001::00fe::::cdef
D)2001:::00fe::cdef

Question 74

In IPv6,the payload length gives the number of octets in the ________.

A)entire packet
B)entire packet minus the main header
C)entire packet minus the main and extension headers
D)entire packet minus the extension headers

Question 75

TCP messages are called ________.

A)frames
B)packets
C)segments
D)fragments

Question 76

Which of the following allows routers to check for errors in the header when a packet arrives?

A)IPv4
B)IPv6
C)both A and B
D)neither A nor B

Question 77

Converting networks to support IPv6 is relatively simple and inexpensive.

Question 78

In IPv6,routers usually only have to consider the hop-by-hop options extension header.

Question 79

If someone says that a 1-bit flag is set,this means that it is given the value ________.

A)0
B)1
C)We cannot say.

Question 80

The encapsulating security protocol offers ________.

A)confidentiality
B)authentication
C)both A and B
D)neither A nor B