Preview - Network Layer

Which of the following are network layer protocols?

• IPv6
• TCP
• UDP
• HTTP

Which of the following is a characteristics of IP?

• Ensure reliable end to end data transmission
• Collisions are avoided in different transmission media
• Sender doesn’t know if the receiver is listening or the message arrived on time
• It provides information on the amounts of memory installed, what IOS images was loaded during boot and more

Why is IPv6 preferred over IPv4?

• Better performance in terms of subnetting
• Increased address space
• Support higher transmission speed
• Suitable for both wired and wireless networks

What is the purpose of default gateway?

• Enable routers to send packets using the default routes
• Default gateways are layer 2 switches which forward packets to routers
• A list of gateways for linking wired to wireless networks
• Hosts will use the default gateway when sending packets to remote networks.

What is the command to display host routing tables?

• show ip route
• netstat -r
• arp -a
• show run

What is the "C" routes in Cisco Routing table?

• Information on: how the route was learned, its trustworthiness and rating
• Identifies a directly-connected network, automatically created when an interface is configured with an IP address and activated.
• Identifies that this is a local interface. This is the IPv4 address of the interface on the router.
• Indicated the routes which are configured by users.

What is the boot up sequence of  a router?

• POST, Load IOS, Load Startup, Bootstrap Loader
• POST, Bootstrap Loader, Load IOS, Load Startup
• Bootstrap Loader, Load IOS, POST, Load Startup
• Load IOS, Load Startup, POST, Bootstrap Loader

What is the purpose of show ip route?

• Displays statistics for all routes on the device
• Displays the contents of the IPv4 routing table stored in RAM
• Displays the IPv6 routes for all interfaces on a router
• Show how the content of routes stored in NVRAM

How do you configure the default gateway of a switch?

•  ip default gateway
• ip route 0.0.0.0 0.0.0.0 <interface>
• ip default-gateway
• default ip-gateway

What is Routing?

•  to take the large network and filter it, without changing the size of the network.
•  to check messages are sent to the right device.
• the process of finding a path on which data can pass from source to destination
• provide optional services to an application developer