2. How data is transported quiz

Which of the following is not a task handled by a router? ​A router forwards broadcasts over the network. ​A router can reroute traffic if the path of first choice is down but a second path is available. ​A router can interpret Layer 3 and often Layer 4 addressing. ​A router can connect dissimilar networks.

A router forwards broadcasts over the network.

What netstat command option lists only current connections, including IP addresses and port numbers? ​-s ​-r ​-n ​-o

-n

By default, the pathping command sends how many pings per hop?​ ​50 ​100 ​200 ​500

100

​Which layers of the OSI model are all routers able to interpret? (Select all that apply) ​1 ​2 ​3 ​4

3 4

A modern ASN consists of how many bits? ​16 ​32 ​64 ​128

32

The router on a network that accepts all unroutable messages from other routers.

gateway of last resort

​A router that connects an autonomous system with an outside network—for example, the router that connects a business to its ISP.

gateway router

What two fields below are used by IPv4 and IPv6 respectively to limit the number of times that a packet can be forwarded on a network? (choose all that apply) ​hop limit ​TTL ​max path count ​total time routing

hop limit TTL

​A repeated trial message transmitted by the tracert and traceroute utilities to trigger routers along a route to return specific information about the route.

probe

The receiving host de-encapsulates the message at each layer in _______ order and then presents the payload to the receiving application.​

reverse

A _______ joins two or more networks and passes packets from one network to another.​

router

Which network routing protocol is a path vector protocol that sends updates between routers using TCP? ​IS-IS ​OSPF ​RIP ​BGP

BGP

True or false-As a network support technician, you only need to know how to support IPv6. ​

False

True or false-IPv4 and IPv6 use the same packet format.​

False

True or false-UDP provides error checking, but not sequencing.​

False

What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol?​ ​Connection-oriented Protocol ​Sequencing and checksums ​Framing ​Flow Control

Framing

What IPv4 protocol handles multicasting for tasks such as videoconferencing or teleconferencing?​ ​ICMP ​ARP ​TCP IGMP​

IGMP

​What versions of the IP protocol are used on networks today? ​IPv1 ​IPv4 ​IPv6 ​IPv5

IPV4 IPV6

​At what layer of the OSI model would a TCP or UDP header be added to a payload? ​Layer 7 ​Layer 4 ​Layer 2 ​Layer 1

Layer 4

What address does ARP work in conjunction with IPv4 to discover? (choose all that apply) ​IP ​MAC ​ARP ​physical

MAC physical

The largest IP packet size in bytes allowable by routers in a path without fragmentation and excluding the frame size.

MTU

​The IP connectionless protocol relies on what other protocol to guarantee delivery of data? ​UDP ​ICMP ​TCP ​ARP

TCP

The_________________routing protocol is a link-state routing protocol based on the shortest path forst algorithm to find the path with the least cost to a destination in a network.

The OSPF (Open Shortest Path First)

R- Describe the difference between dynamic ARP table entries and static ARP table entries.​

The difference between dynamic ARP table entries and static ARP table entries is that with dynamic entries, the ARP cache is automatically updated. Static entries on the other hand are configured manually using the "arp -s" command.

R- Compare the three categories of routers.

The first type of routers are interior routers which directs data within one autonomous system. Gateway routers however connect an autonomous system with an outside network, and exterior routers direct data between systems.

​Properties of a route used by routing protocols to determine the best path to a destination when various paths are available. Routing metrics may be calculated using any of several variables, including hop count, bandwidth, delay, MTU, cost, and reliability.

routing metric

Which of the following are types of entries an ARP table contains? (choose all that apply) ​Static ​Flat ​Basic ​Dynamic

static dynamic

The TCP three way_______________ is performed before TCP transmits the actual data.​

three way handshake

What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet? ​ Differentiated Services (DiffServ) ​Internet header length (IHL) ​Time to Live (TTL) Padding

​ Differentiated Services (DiffServ)

What parameter can be combined with the traceroute command to instruct it to use ICMP echo requests instead of UDP datagrams? ​ ​-n ​-p ​-I ​-d

​-I

What protocol replaces ARP, IGMP, and ICMPv4 on IPv6 based networks?​ ​ARPng ​BGPv6 ​IGMPv6 ​ICMPv6

​ICMPv6

R- What is the difference between static and dynamic routing?

The main difference between dynamic and static routing is that when using static routing, routes and route information must be entered and updated manually, and no route information is exchanged between routing devices. While when one is using dynamic routing, routing information is communicated between devices automatically and changes in the network are easily recognized.

True or false-IP is an unreliable, connectionless protocol.​

True

True or false-On IPv4 networks, IGMP operates at the Network layer of the OSI model to manage multicasting.​

True

R- List some examples of routing metrics that might be used to determine the best path for data.

Two routing metrics that could be used to determine the best path for data are the hop count which is the number of hops to reach a node, and the costs which are the numbers associated with travelling between two points.

When viewing the routing table on a UNIX system, what flag indicates if a route is a usable route?​ ​I ​H ​G ​U

U

​___'s lack of sophistication makes it more efficient than ​TCP.

UDP

A number indicating a protocol's reliability, with lower values being given higher priority. This assignment can be changed by a network administrator when one protocol should take precedence over a previously higher-rated protocol on a network.

administrative distance

A globally unique number that identifies an autonomous system. ASNs work similarly to IP addresses that identify individual nodes on a network. Each ASN now consists of 32 bits instead of 16 bits, and they are assigned by IANA.

autonomous system number

A router that directs data between networks within the same autonomous system.

interior router

​The delay between the transmission of a signal and its receipt.

latency

What type of routing protocol enables routers to communicate beyond neighboring routers, allowing each router to create a map of an entire network?​ distance vector ​link state ​exterior gateway map extension

link state

A process whereby routers learn about all of the devices on their networks. On IPv4 networks, this process is managed by ARP with help from ICMP. On IPv6 networks, NDP (Neighbor Discovery Protocol) automatically detects neighboring devices and automatically adjusts when nodes fail or are removed from the network.

neighbor discovery

ICMP (Internet Control Message Protocol) is a _______ layer core protocol that reports on the success or failure of data delivery.​

network

What happens when a router receives a packet with a TTL of 0?​ ​The router attempts to forward the traffic on a local network. ​The router drops the packet and sends an ICMP TTL expired message back to the host. ​The router resets the TTL to 128. ​The router marks the packet as corrupted and forwards it to the next hop.

​The router drops the packet and sends an ICMP TTL expired message back to the host.

What TCP field below allows the receiving node to determine whether a TCP segment is corrupted during transmission?​ ​checksum ​sliding window ​acknowledgement number ​TCP header length

​checksum

What routing protocol criteria is defined as the time it takes to recognize a best path change in the event of a network outage? ​administrative distance detection ​convergence time ​overhead calculation ​downed path detection

​convergence time

In IPv6, what field is used to indicate what sequence of packets from one source to one or multiple destinations a packet belongs to? ​ ​traffic class ​group ID ​flow label ​traffic exchange

​flow label

​What command can be used on a Cisco router to view the routing table? ​route print ​netstat -r ​route ​show ip route

​show ip route

In a TCP segment, what field indicates how many bytes the sender can issue to a receiver while acknowledgement for the segment is outstanding?​ urgent pointer​ ​sliding window ​sequence number ​URG flag

​sliding window