Recent additions Flashcards
What are the EIGRP k values, in order?
K1 = Bandwidth modifier K2 = Load modifier K3 = Delay modifier K4 = Reliability modifier K5 = Additional Reliability modifier
3 steps to create a key for use in routing authentication
- Create the key chain
- Create the key
- Set the key string
2 steps to have EIGRP use a key chain in authentication
- Under a given interface, set up authentication for the routing protocol.
- Staying under that same interface, bind the key-chain that will be used to the auth line.
Syntax to create a key chain
conf t
key chain name
Syntax to create a key under a key chain
key #
Syntax to set a text string for a key
key-string text-string
Syntax to set up authentication for eigrp under an interface.
conf t
int gi1/0
ip authentication mode eigrp asn md5
Syntax to bind a key chain to EIGRP authentication
conf t
int gi1/0
ip authentication key-chain eigrp asn key-chain name
Syntax to add automatic summarization to EIGRP
auto-summary
Change the bandwidth or delay on an interface for EIGRP
conf t
int gi1/0
bandwidth value
delay value
Syntax to set the hello and hold timers for EIGRP
conf t
int gi1/0
ip eigrp hello-interval seconds
ip eigrp hold-time seconds
Configuration to allow for unequal cost load balancing in EIGRP
variance multiplier
Syntax to instantiate a DHCP pool
ip dhcp pool pool-name
Syntax to set the lease time for a DHCP pool
lease days hours min
Syntax to set the default gateway for a DHCP pool
default-router IP address
Syntax to set the DNS server for a DHCP pool
dns-server DNS IP
2 versions of the syntax to set the subnet for a DHCP pool
network subnet subnet mask
network subnet /subnet length
Syntax to set the domain name for a DHCP pool
domain-name name
In Frame Relay, what does LMI stand for?
Local Management Interface
What does DLCI stand for?
Data Link Connection Identifier
What encapsulation is set on a serial interface that will connect to a frame relay network?
frame-relay
Syntax to set a serial interface to frame relay encapsulation
conf t
int s1/0
encapsulation frame-relay
2 options for encapsulation frame-relay
- cisco
2. ietf
When leaving off the specific encapsulation type for the command “encapsulation frame-relay”, what is the default?
cisco
Syntax of the frame-relay map command
frame-relay map ip ip address dlci [broadcast]
Syntax to bind a dlci to an interface
frame-relay interface-dlci dlci
Command to show InArp data
show frame-relay map
What is the successor?
The successor is the path that has the best metric.
What is the Feasible Distance?
The metric of a given route from the current router’s point of view.
What is the Reported Distance?
The metric of a given route from the neighbor’s point of view.
If a path meets the feasibility condition, but does not fall within variance parameters, what happens to it?
It is held in reserve as a feasible successor, one which may take over if the current successor fails.
What is the feasibility condition?
The reported distance of a path must be less than the FD of the path on the current router.
What happens to a path who’s FD falls within variance parameters but does not meet the feasibility condition?
It’s not installed in the routing table, nor will it be a Feasible Successor
How does a router determine if a path can be a Feasible Successor?
If the path’s RD is less that the FD, it will be a Feasible Successor.
When you show the routing table, what letter signifies that route was learned via EIGRP?
D
In the 4 layer TCP/IP model, what are the names of the layers?
- Application
- Transport
- Internet
- Link
In the 5 layer TCP/IP model, what are the names of the layers?
- Application
- Transport
- Network
- Data Link
- Physical
What does the Application layer in the TCP model map to in the OSI model?
Application
Presentation
Session
What does the Transport layer in the TCP model map to in the OSI model?
Transport
What does the Internet or Network layer in the TCP model map to in the OSI model?
Network
What does the Link layer in the TCP model map to in the OSI model?
Data Link
Physical
What are the first 4 syslog level names, starting with level 0?
0 - Emergency
1 - Alert
2 - Critical
3 - Error
What are the last 4 syslog level names?
4 - Warning
5 - Notification
6 - Informational
7 - Debugging
What severity levels will be sent to the syslog server if “logging trap 4” is configured?
Levels 0 - 4 Emergency Alert Critical Error Warning
If “logging trap informational” is set, what numerical levels will be set to syslog?
0 - 6
What does PPP stand for?
Point to Point Protocol
What are 2 PPP control protocols?
LCP
NCP
What do NCP and LCP stand for?
Network Control Protocols
Link Control Protocol
What’s a glaring difference between NCP and LCP?
LCP is a single protocol, whereas NCP is a suite of protocols that are each specific to a Layer 3 protocol.
4 features of PPP LCP
- Loop detection
- Error detection
- Multilink support
- Authentication
What 2 types of authentication are supported by PPP?
PAP
CHAP
What do PAP and CHAP stand for?
Password Authentication Protocol
Challenge Handshake Authentication Protocol
Which PPP auth protocol sends a password in clear text?
PAP
What are the 3 steps of a successful CHAP authenticatoin?
- Authenticator sends challenge packet.
- Caller hashes password etc and sends back hashed value.
- Authenticator compares submitted value to their own hashed value, and if they match it allows the caller in.
Command to set PPP on a serial interface
conf t
int s1/0
encapsulation ppp
2 general steps to have a PPP link use PAP or CHAP
- Configure the username/password for the calling router.
2. Set the serial link to use PPP PAP
What will the state of a serial link be if PPP authentication fails?
Up/down
Syntax to set a username/pass for use in PPP authentication
username caller hostname password password
Syntax to have a serial interface use CHAP
conf t
int s1/0
ppp authentication chap
2 useful debug commands for PPP
debug ppp authentication
debug ppp negotiation
