WorksheetsIntroduction to Routing
Total questions: 15
Worksheet time: 9mins
The purpose of Data Link Layer (Layer 2) is to deliver frames across
the internet
a single link
several networks
a adjacent networks
The job of the Network Layer is to deliver packets across
the internet
a single link
networks along the best path
a single network
Select all of the frame formats on the wide area network (WAN) side
ATM
Frame Relay
PPP
Ethernet
Select all that applies to a router
Each side of a router is a different network with its own identity
Each side of a router is on the same broadcast domain
Routers connect end-devices to end-devices
Routers do encapsulation / decapsulation of packets into and out of frames
A routing table contains (select all that is correct)
A list of all networks known to the router
The cost to reach each network
The direction that packets can be sent to reach the network
The MAC addresses of end-devices
Routers use a priority system to make decisions as to how to send packets across multiple redundant paths, what is the first step in this priority system ?
If there are multiple entries in the routing table for the same network which is of the same size and has the same cost, choose one entry at random and deliver the packet using the Via information on that route.
If multiple routes have the same size, then choose the route with the lowest cost.
If multiple routes match the destination IP address, choose the route that has the smallest IP address range
The destination IP address must fall in the network range of a route entry.
How do routers establish route entries (select all that is correct) to build the route table ?
Router learn about networks that are directly connected to them.
Route entries can be manually entered by network administrators
Routers learn about networks using the DHCP server.
Network administrators can setup a dynamic routing protocol on routers
If an entry in the routing table is out of date or points in the wrong direction, then (select all that applies)
packets may take a path to the destination network which is not the best path
packets may loop around and around within the network and eventually get delivered.
packets may never reach the network because a router drops them when it does not have a route to that network
packets may loop around and around within the network and never get delivered.
What do you understand by the term convergence in relation to routers?
the state where all routers have accurate and up to date knowledge of all the users in the wider network
the state where all routers have accurate and up to date knowledge of all the end devices in the wider network
the state where all routers have accurate and up to date knowledge of all the switches in the wider network
the state where all routers have accurate and up to date knowledge of all the networks in the wider network
What are the goals of a dynamic routing protocol (select all that is correct) ?
To find and use an alternate route if an existing route is removed from the table.
To dynamically learn and fill the routing table with a route to all networks in the overall internet.
If more than one route to a network is available, to put the best route in the routing table. The other routes may also be added as fallback entries.
To determine when routes in the table are no longer valid, and to remove them from the routing table.
The cost value that is put in for each entry in a routing table is also known as the cost metric for that route. What is the cost metric used by the RIP protocol ?
the "bandwidth" across each Layer 2 link to determine its cost metric
"bandwidth" of links, "delays" to cross links, the traffic "load" currently on a link, and the overall "reliability" of a link
the number of "hops" that a packet must cross to get from its source to the destination
the number of "switches" that a packet must cross to get from its source to the destination
In distance vector routing protocol
each router receives routing information from its neighboring routers and they integrate this information into their own routing tables
each router sends information about the networks and links that it is directly connected, to the wider network in order to build an entire map of the wider network
each router sends information about the networks and links that it is directly connected to the wider network so that routers in the wider network can build their own routing table
each router receives routing information from its neighboring routers enabling them to build an entire map of the wider network
In link state routing protocol
each router receives routing information from its neighboring routers and they integrate this information into their own routing tables
each router sends information about the networks and links that it is directly connected, to the wider network in order to build an entire map of the wider network
each router sends information about the networks and links that it is directly connected to the wider network so that routers in the wider network can build their own routing table
each router receives routing information from its neighboring routers enabling them to build an entire map of the wider network
On most CISCO routers, the IOS firmware is stored
in a USB stick
in a removable flash card
in the NVRAM
in the hard disk drive
What command is used to display a router's routing table ?
show ip interface
show running-configuration
show ip route
show interface
