Routers Flashcards
When a computer knows the destination IP address is not on its network, what message does it send to the default router?
ARP message
What is a primary goal of a router?
stop broadcasts
On a router by default, all interfaces are ________.
down, administratively down
Which command displays the networks a router can communicate with?
show ip route
How can you create a default route on a router?
ip route ‘destination-ip’ ‘destination-subnet’ ‘gateway-ip’
On a serial connection, what end of the connection needs to set the clock?
DCE
Which command can be used to impersonate the service provider and set the speed?
clock rate x
How do you create a floating static route?
increase the administrative distance to be greater than the default
What two commands are needed when assigning a vlan to a switch port?
switchport mode access
switchport access vlan x
What command is used to create a subinterface?
interface FastEthernet x/y.z
.z assigns subinterface to interface
What command is used to assign a tag to a subinterface?
encapsulation dot1q z
z refers to subinterface
What command is used to enable trunk mode on a port?
switchport mode trunk
What is the command for creating a VLAN?
vlan x
Which command should you use to assign a vlan to an interface?
switchport access vlan x
What command is used to create a subinterface?
interface ‘type’ x/y.z
When configuring a trunk port on a switch supporting both Cisco ISL and 802.1q encapsulation, which command should be entered first?
switchport trunk encapsulation dot1q
What does Cisco VoIP require from DHCP?
ip address and TFTP server
What are the 3 options a DHCP server will most likely assign?
router(gateway), subnet mask, dns server
On which of the following platforms is DHCP typically configured?
DHCP from a network device
DHCP relay from a central DCHP server
What type of message is DHCP?
broadcast
When configuring DHCP for distributing a specific range of addresses, what must you configure first?
ip dhcp excluded-address ‘ip-address range start’ ‘ip-address range end’
What command is used to configure DHCP for a vlan?
ip dhcp pool vlan x
What command is used to assign DNS server(s)?
dns-server ‘ip-address’ ‘ip-address2’
What command is used to show the binding ip addresses?
show ip dhcp binding
What windows command is used to end a lease on an IP address from a DHCP server?
ipconfig /release
What windows command is used to request a new ip address from a DHCP server?
ipconfig /renew
What is the command for a DHCP relay?
ip helper-address ‘ip-address’
What is the function of routing protocols?
educate routers dynamically without user involvement
What is the only way a static route will detect failure?
link status changes to down
Which routing protocols use distance vector (DV)?
RIP, EIGRP, BGP
What is a distance vector protocol?
only know information from neighbor devices
What is a link state protocol?
maintains map of network system, loop free
What is the largest network that uses BGP?
the internet
Is distance vector or link state more resource efficient?
distance vector
Does distance vector or link state have loop free mechanics in place?
link state
What is a metric?
measurement for best path
What is the metric for RIP?
hops
What is the metric for IGRP?
bandwidth/delay
Which routing protocols use link state?
OSPF
What is the metric for OSPF?
bandwidth
What is a feature of EIGRP?
unequal load balancing
What is IS-IS?
routing protocol similar to OSPF, developed by OSI
What is the default advertising timer for RIPv2?
30 seconds
What was one of the most significant changes between RIP versions 1 and 2?
RIPv2 is classless
What does the network command do (in RIP)?
tells RIP what networks to advertise
tells RIP what interfaces to send advertises out of
If a packet comes into a router’s interface from another network and it does not match a route in the routing table, what will the router do with the packet?
drop the packet
What command shows the details of the routing protocol?
show ip protocols
