ccna interview questions and answers

Part - 47 CCNA Interview Questions and Answers

251 What does -1 mean in an extended IPX access-list?

A.) Any IP address

B.) Deny all

C.) Deny host

D.) Any host or any network

Ans D

For IPX access lists, the -1 is a wildcard that signifies Any Host or Any Network.

252 What parameter is used with statically assigned routers to tell packets which interface to use to reach a distant network?

A.) Mask

B.) Subnet

C.) Default gateway

D.) Interface

Ans D

The interface parameter tell a packet which interface to use to reach other networks.

253 Which of the following protocols are used to get an IP address from a known MAC address?

A.) BootP

B.) TCP

C.) IP

D.) ARP

E.) RARP

F.) ICMP

Ans A E

Reverse Address Resolution Protocol - RARP is ARP's counterpart, but it resolves IP addresses to MAC addresses typically on diskless workstations. BootP allows a host to resolves it's own MAC address to an IP address.

254 What does the Spanning Tree Algorithm (STA) do?

A.) Restore lost frames

B.) Builds routing tables for routing through an internetwork

C.) Forward packets through a switch

D.) STA is implemented by STP to prevent loops

Ans D

IEEE 8021.d Spanning Tree Protocol (STP) was developed to prevent routing loops in a network. If a router, switch, or hub has more then one path to the same destination, a routing problem could occur. To prevent this, the Spanning Tree Protocol is executed between the devices to detect and logically block redundant paths from the network. The main function of the Spanning Tree Protocol is to allow redundant network paths without suffering the effects of loops in the network. The Spanning Tree Algorithm (STA) implemented by STP prevents loops by calculating a stable Spanning Tree network topology. When creating fault tolerant internetworks, a loop-free path must exist between all Ethernet nodes in the network. Spanning Tree frames called Bridge Protocol Data Units (BPDUs) are sent and received by all switches in the network at regular intervals.

255 IP extended access lists use which of the following as a basis for permitting or denying packets?

A.) destination address

B.) all of the above

C.) protocol

D.) source address

E.) port

Ans B

All of the above are basis for permitting or denying IP packets for use with an Extended IP access list.

256 What is the extended IPX access list range?

A.) 901-1000

B.) 100-199

C.) 900-999

D.) 1000-1000

Ans C

Cisco has setup ranges of numbers to signify access lists. 900-999 is the range for the Extended IPX access lists.

257 CPE is an acronym for which of the following?

A.) Customer Premise Equipment

B.) Central Processing Engineering

C.) Customer Process Equipment

D.) Central Processing Equipment

Ans A

Customer Premise Equipment (CPE) are devices physically located at the subscriber's premises. Includes both owned and leased equipment.

258 How often does IP RIP send out routing table updates by default?

A.) They send complete updates every 30 seconds

B.) They send partial updates every 30 seconds

C.) They send complete updates every 60 seconds

D.) They send partial updates every 60 seconds

Ans A

Routing Information Protocol (RIP) is a distance vector routing protocol that used hop count as it's metric. The maximum hop count is 15, 16 hops is considered unreachable. RIP updates are broadcast every 30 seconds by default. RIP has an administrative distance of 120.

259 Which ISDN protocol prefix specifies switching and signaling?

A.) I

B.) E

C.) Q

D.) S

Ans C

These protocols deal with ISDN issues: E - Specifies ISDN on the existing telephone network. I - Specifies concepts, terminology, and services. Q - Specifies switching and signalling.

260 CSMA/CD stand for which of the following?

A.) Carrier Sense, Multiple Access with Collision Detection

B.) Collision Sense, Multiple Access with Collision Detection

C.) Collision Sense, Multiple Access with Carrier Detection

D.) Carrier Sense, MAC address with Collision Detection

Ans A

The IEEE standard for Carrier Sense Multiple Access / Collision Detection is 802.3. Also know as Ethernet.