Networking Interview Questions
9 Apr, 2007
- Which OSI layer supports the communication component of an application?
* Data-Link
* Physical
* Session
* Presentation
* Application
* Transport
Correct answer: E
Layer 7 the Application layer performs this function.
- Identify the length of an IPX address and it’s components?
* 80 bits, 48 bits network and 32 bits node
* 32 bits, 16 bits network and 16 bits node
* None of the above
* 80 bits, 32 bits network and 48 bits node
Correct answer: D
IPX address has 2 components; network and node. The network address is 32 bits and the node is 48 bits, total of 80 bits.
9 Apr, 2007
- Identify the 3 characteristics of IPX RIP?
* Distance vector
* Does not support multiple paths
* 60 second updates
* Default encapsulation is SAP
* Uses ticks and hop count as a metric
Correct answer: A C E
IPX RIP is a distance vector routing protocol, it does support multiple paths, the default encapsulation is ‘novell-ether’, it uses tick count as a primary metric and hop count as a tie breaker and it sends it’s updates every 60 seconds.
- Identify the access-list range for an extended IP access-list?
* 800 - 899
* 1 - 99
* 1000 - 1099
* 100 - 199
Correct answer: D
IP extended access-lists use the number range of 100-199.
9 Apr, 2007
- Identify the 2 types of access-list filters that control SAP traffic?
* Novell-ether
* Arpa
* Input-sap-filter
* Round-robin
* Output-sap-filter
Correct answer: C E
SAP’s can be blocked by 2 methods; inbound and outbound.
- Identify the 3 guidelines for routers in the same autonomous system?
* Must be configured for IGRP or RIP
* Interconnected
* Assigned the same autonomous system number
* Configured for the same routing protocol
* Must be same model of router
Correct answer: B C D
Autonomous system must be interconnected, assigned the same AS # and configured with the same routing protocol.
9 Apr, 2007
- Identify 1 characteristic of RARP?
* IP to MAC address translation
* Connectionless delivery of packets
* Can be used to initiate remote O/S load sequence
* Generates error and control messages
Correct answer: C
Reverse Address Resolution Protocol is used to obtain a layer 3 address if the MAC address is known which then facilitates the loading of the O/S.
- Identify the protocol to test connectivity without configuring any layer 3 protocols?
* TCP
* Ping
* IP
* CDP
* Telnet
Correct answer: D
CDP can be used to verify connectivity prior to any layer 3 protocols being configured.
9 Apr, 2007
- Which OSI layer handles physical address, network topology?
* Presentation
* Physical
* Transport
* Application
* Data-Link
* Network
Correct answer: E
Layer 2 the Data-Link layer performs this function.
- Identify 2 reasons for disabling CDP?
* If the router is not configured for RIP
* Save bandwidth by eliminating overhead
* If the router is configured for Appletalk
* When connected to a non-Cisco router
Correct answer: B D
CDP can be disabled here are a couple of reasons. Connecting a Cisco router to a non-Cisco router. Don’t want to exchange CDP information to save bandwidth.
