Chapter 6

Check all that apply about connectionless services.

-Each item carries all information needed to deliver it even if some links/nodes fail -Intermediary nodes do not store any state about the offered service -Items of the "same conversation" may take different paths.

all concepts/tools/protocols that may be used to modify (update) routing tables.

-Routing Information Protocol(RIP) -Distance Vector Routing -Link State Routing

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs (Round 1, 2,...). Fill in the table below with the distance vector that Node A sends its neighbors on Round 1. If the distance is not yet known, fill in with the value 99.

0;1;2;2

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs. Fill in the table below with the distance vector that Node A sends its neighbors on Round 0. If the distance is not yet known, fill in with the value 99.

0;1;2;99

The IP address of some URL at Auburn University is (in binary. Nibbles are separated just to help readability) 1000 0011 1100 1100 0110 1110 1001 1110 This IP address is the same as __________________.

0x83CC6E9E & 131.204.110.158 in dotted decimal notation

Determine network ID from an IP Address: 1) first check class 2)if a.b.b.c/d

1) class A- keep first element, rest is 0 class B- keep first two elements, rest is 0 class C- keep first 3, rest is 0 2) d=how many ones in front Write out a.b.b.c as binary, under write corresponding subnet using d Figure out how many zeros at end of subnet sub those zeros into a.b.b.c binary= answer in decimal

Check all that applies to this frame "sniffed" on the medium (expressed in hexadecimal. Preamble is not included):

1) Check the type- (13, 14) do determine which packet 2)after first 22 elements, if next starts with [12 06 10 = TCP] [12 11 10= UDP] 3) if UDP, then DIX 4) ipv4, then without options

Match each protocol to the routing algorithm used. 1)Routing Information Protocol 2)Open Shortest Path First 3)Border Gateway Protocol

1) Distance Vector routing 2) Link state routing 3)path vector routing

This question is about how the Internet Protocol (IP) handles a packet P and decides where to deliver it. Consider a device D with IP address 134.89.200.145/24. On Device D, IP is handed a packet P with a destination IP address 134.89.200.24. Provide the order in which IP on Device D will perform these actions. The earliest action must be assigned 1. Any action that is incorrect or is not performed must be assigned the number 0.

1) check If packet p is for d 2)handle packet p to appropriate protocol at the transport layer 134.89.200.145 & 255.255.255.0 134.89.200.24 & 255.255.255.0 = same

A host H has IP address A represented in dotted-decimal Select the instruction that computes the network ID NID of IP Address A.

1) convert to subnet mask 2)convert subnet to hexadecimal 255-ff, 248-f8, 128-80, 192-c0, 254-fe, 240-f0, 224-e0

Subnet Mask

1) given a.b.c.d/e, e Is how many ones in front, rest zeros 2) split into 4 8bits 3) convert binary to decimal= answer

This question is about how the Internet Protocol (IP) handles a packet P and decides where to deliver it. Consider a device D with IP address 134.89.200.145/24. On Device D, IP is handed a packet P with a destination IP address 131.204.65.170. Provide the order in which IP on Device D will perform these actions. The earliest action must be assigned 1. Any action that is incorrect or is not performed must be assigned the number 0.

1) see if destination IP matches any in the destination column, if so the corresponding router is the answer 2)if not check which destination Id gives you the closest match Example) 13.45.6.7= 13.45.00 not 13.0.0.0; after you get a match, answer is corrssponding router

1)The network ID of IP Address 200.20.14.53 is _________. 2)The class of IP Address 128.200.40.13 is _________. 3)The network ID of IP Address 164.200.40.13 is _________.

1)200.20.14.0 2) B 3)164.200.0.0

The network ID of IP Address 1.20.140.153/17 is

1.20.128.0

Suppose you want to send some packet to the host from which you are sending. You could use this (these) addresse(s).

127.0.0.1 0.0.0.0

The network ID of IP Address 128.200.104.13/19 is

128.200.96.0

A host H has IP address 131.204.14.65. Suppose you want to send some packet to all hosts on the same network as H . You could use this (these) addresse(s).

131.204.255.255 (Because class B- with this question 255 starts at end)

The subnet mask of network N is 255.255.255.240. This network N can assign unique addresses to up to _______________ hosts.

14

The network ID of IP Address 172.20.14.53/28 is _________.

172.20.14.48

The network ID of IP Address 192.202.100.243/28 is ____

192.202.100.240

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs (Round 1, 2,...). Fill in the table below with the distance vector that Node B sends its neighbors on Round 1. If the distance is not yet known, fill in with the value 99.

1;0;3;1

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs. Fill in the table below with the distance vector that Node B sends its neighbors on Round 0. If the distance is not yet known, fill in with the value 99.

1;0;5;1

The length of an IPv4 header is at least ________ bytes.

20

A host H has IP address 200.204.14.65. Suppose you want to send some packet to all hosts on the same network as H . You could use this (these) addresses. *check class, keep the correct elements, other is 255

200.204.14.255

The network ID of IP Address 223.202.100.13/30 is

223.202.100.12

A class C network can assign unique addresses to up to _______________ hosts.

254

The subnet mask of IP Address 164.200.40.13/22 is

255.255.252.0

The subnet mask of IP Address 63.20.140.153/26 is

255.255.255.192

The subnet mask of IP Address 200.20.14.53/27 is

255.255.255.224

A user types the command "arp -a" on the console of the machine csexmac161engauburnedu. The arp command displays (see picture) the content of the ARP cache of the machine csexmac161engauburnedu. Suppose that IP on this machine must send a packet to the interface with IP Address 192.168.1.144. When IP asks ARP for the address 192.168.1.144, ARP will return the MAC address

2:f:b5:13:2:ca

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs (Round 1, 2,...). Fill in the table below with the distance vector that Node D sends its neighbors on Round 1. If the distance is not yet known, fill in with the value 99.

2;1;3;0

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs (Round 1, 2,...). Fill in the table below with the distance vector that Node C sends its neighbors on Round 1. If the distance is not yet known, fill in with the value 99.

2;3;0;3

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs. Fill in the table below with the distance vector that Node C sends its neighbors on Round 0. If the distance is not yet known, fill in with the value 99.

2;5;0;3

A class B network can assign unique addresses to up to _______________ hosts.

2^16-2

The subnet mask of network N is 255.255.128.0. This network N can assign unique addresses to up to _______________ hosts.

32766

In the IPv4 header, the size of the header length (IHL) field on an IPv4 header is ________ bits.

4

The size of the version field on an IPv4 header is ________ bits.

4

Match each protocol with its protocol number used in the protocol (number) field in the IPv4 header. TCP UDP ICMP Ethernet Wifi (IEEE 802.11) Bluetooth

6 17 1 Not Applicable Not Applicable Not Applicable

The length of an IPv4 header is at most ________ bytes.

60

The subnet mask of network N is 255.255.255.192. This network N can assign unique addresses to up to _______________ hosts.

62

The total length of an IPv4 packet is at most ________ bytes.

65535

A network is made of a ring of 16 nodes using bidirectional point-to-point links. These nodes use distance vector routing. Suppose these nodes turn on at the same time. How many rounds of communications are needed for all the nodes to update their routing tables with ALL nodes in the network.

8

*Check saved photo Consider this network of routers A, B, C, and D that are using Distance Vector Routing. Assume that all routers are turned on at the exactly same time 0. At time 0, the routers know only the cost to reach their immediate neighbors. At time 0 (Round 0), all routers send their distance vector to their immediate neighbors. Each 30 seconds, a new round of exchanges occurs. Fill in the table below with the distance vector that Node D sends its neighbors on Round 0. If the distance is not yet known, fill in with the value 99.

99;1;3;0

Determine the class of IP Address: (determined by first element) Class A Class B Class C Class D Class E

A= 1-127 B= 128-191 C=192-223 D=224-239 E=240-254

A class A network can assign unique addresses to up to _______________ hosts.

About 16 millions

BGP is likely used to update routing tables on Auburn University routers.

False; auburn is an autonomous system so it uses interior (BGP is exterior)

With this routing algorithm, the node forwards each (unseen) packet on all outgoing interfaces, except the one the packet came in from.

Flooding

In the IPv4 header, the _________ field is used to detect corrupted bit(s) in the IP header of an IPv4 packet

Header Checksum

When a packet is successfully delivered without any issue, this (these) protocol(s) would not likely be involved.

ICMP

IP (Internet Protocol) provides service directly to these protocols.

ICMP TCP UDP

The Border Gateway Protocol (BGP) uses _______ as its network protocol.

IP

The Open Shortest Path First protocol (OSPF) uses _______ as its network protocol.

IP

The Routing Information Protocol (RIP) uses _______ as its network protocol.

IP

These are routing mechanisms

IP Hot Potato Early Exit

ARP takes as input ________

IP address

Check the information that a DHCP Server provides.

IP address IP address of gateway router Subnet mask IP address of DNS server

In the context of computer networks, IP stands for ______________.

Internet Protocol

In this (these) distributed routing algorithm(s), each node communicates with all other nodes about its distance to its immediate neighbors only.

Link State Routing

ARP returns as output _____

MAC address

This question is about how the Internet Protocol (IP) handles a packet P and decides where to deliver it. Consider a device D with IP address 134.89.200.145/24. On Device D, IP is handed a packet P with a destination IP address 131.204.65.170. Provide the order in which IP on Device D will perform these actions. The earliest action must be assigned 1. Any action that is incorrect or is not performed must be assigned the number 0.

MODULE 6 SSQ7 ORDER 1)check if packet P is for device d 2)hand Packet P to the appropriate protocol at the transport layer. If matches device d= last one Or start with 1) then 3) 3)check if the IP destination address of Packet P is local 4)read the routing table 5)if found ask for that arp MAC address router 6)send packet p to that arp MAC address router

A host H has IP address A represented in dotted-decimal as 56.204.14.65/9. Select the instruction that computes the network ID NID of IP Address A.

NID = A & 0xff800000

A host H has IP address A represented in dotted-decimal as 56.204.14.65/13. Select the instruction that computes the network ID NID of IP Address A.

NID = A & 0xfff80000

A host H has IP address A represented in dotted-decimal as 191.204.14.65. Select the instruction that computes the network ID NID of IP Address A.

NID = A & 0xffff000000

A host H has IP address A represented in dotted-decimal as 191.204.14.65/20. Select the instruction that computes the network ID NID of IP Address A.

NID = A & 0xfffff000

A host H has IP address 56.204.14.65. Suppose you want to send some packet to all hosts on the same network as H . You could use this (these) addresses.

None of these answers (I think it would just be 56.255.255.255)

In this (these) distributed routing protocols(s), each node communicates will all other nodes about its distance to its immediate neighbors only.

OSPF

This (These) protocol(s) use(s) link state routing or one of its improved variants.

OSPF

_________________ is an interior gateway protocol using ____________ routing.

OSPF; Link State

In this (these) distributed routing protocol(s), each node communicates ONLY with its immediate neighbors to "learn" about the other nodes on the network.

RIP BGP

This (These) protocol(s) is (are) interior gateway protocol(s) used to update routing tables.

RIP OSPF

This (These) protocol(s) is (are) routing protocol(s) (modifying routing tables) that could be used on autonomous systems (i.e., not on the Internet backbone).

RIP OSPF

is an interior gateway protocol using ____________ routing.

RIP; Distance Vector

These devices run routing daemons to update routing tables on the Internet.

Routers L3 switches

The Border Gateway Protocol (BGP) uses _______ as its "transport" protocol.

TCP

Match the protocols to their transport protocols they use. BGP OSPF RIP

TCP raw sockets UDP

Routing protocols such as RIP, OSPF or BGP periodically update the routing tables.

TRUE

The Routing Information Protocol (RIP) uses _______ as its "transport" protocol.

UDP

In the context of computer networks, ARP stands for

address resolution protocol

In the OSI reference model, this layer provides service directly to the network layer.

data link

When implementing a connectionless service, we use ___________________ to carry messages.

datagram

In the context of computer networks, DHCP stands for

dynamic host configuration protocol

Routing protocols such as IP, RIP, OSPF or BGP periodically update the routing tables.

false

Of the routing algorithms we studied, _______________ is the simplest one.

flooding

A routing table is similar to a(n) _______________ for a road trip.

guiding (directions) sign at an intersection

In the context of computer networks, ICMP stands for

internet control message protocol

A network is made of 16 nodes using a broadcast medium. These nodes use distance vector routing. Suppose these nodes turn on at the same time. How many rounds of communications are needed for all the nodes to update their routing tables with ALL nodes in the network.

not 8 not 16

The Open Shortest Path First protocol (OSPF) uses _______ as its "transport" protocol.

raw sockets

Check all that apply about connection-oriented service(s).

requires circuit set up

In the IPv4 header, the TtL (Time To Live) is related to the maximum number of _________________.

routers the packet can traverse

These functions services are offered by the network layer.

routing addressing

The Internet is a _______ switching system.

store-and-forward packet

In the IPv4 header, the Protocol (number) is related to the protocol used by the payload at the__________ layer.

transport

The size of the options field in an IPv4 header is ___________ bytes.

variable

When implementing a connection-oriented service, we use ___________________ to carry messages.

virtual circuits

In this (these) distributed routing algorithm(s), each node communicates ONLY with its immediate neighbors to "learn" about the other nodes on the network.

Distance Vector Routing & Path Vector Routing

This (These) protocol(s) is (are) exterior gateway protocol(s) used to update routing tables.

BGP

This (These) protocol(s) is (are) routing protocol(s) (modifying routing tables) that could be used on the Internet backbone.

BGP

all concepts/tools/protocols that may be used to modify (update) routing tables.

BGP OSPF

This (These) protocol(s) use(s) distance vector routing or one of its improved variants.

BGP RIP

IP (Internet Protocol) may get service directly from these protocols.

Bluetooth Wifi Ethernet