Answers to Q A Section
1 Routers limit network traffic by controlling what?
a. DNS domain b. Broadcast domain c. Microsoft broadcast domains d. Novell SAP broadcasts
Answer: b
Routers operate on the network layer. Routers limit the broadcast domain.
2 Which layer of the OSI model is responsible for converting frames into bits and bits into frames?
a. Network layer b. Physical layer c. Data-link layer d. LLC layer
Answer: c
The data-link layer is responsible for converting frames into bits and vice versa.
3 Which scheme suppresses a route announcement out an interface from which the route was learned?
a. Holddowns b. Split horizon c. Poison reverse d. Passive interface Answer: b
Split horizon does not announce routes out the interface from which the route was learned.
4 Convert the following IP address into dotted decimal format: 10100010001011010001100111000000
Convert every 8 bits into decimal: 10100010 = 162, 00101101 = 45, 00011001 = 25, 11000000 = 192. The answer is 162.45.25.192.
5 List the routing protocols that support VLSM.
d. EIGRP, OSPF, RIPv2, IGRP Answer: b
EIGRP, OSPF, IS-IS, and RIPv2 support VLSM. RIPv1 and IGRP do not support VLSM.
6 When you have configured your router for EIGRP routing, how do you configure the gateway of last resort?
a. Use the ip default-gateway command.
b. Use the ip-default gateway command.
c. Use the ip default-network command.
d. Use the ip default-gateway-network command. Answer: c
You use the ip default-network command to configure the gateway of last resort. You use the ip default-gateway command when routing is disabled.
7 If a Token Ring has been configured with ring number 24, what is its hexadecimal equivalent?
a. 0x18
b. 0x24
c. 0x16
d. 0x10 Answer: a
The hexadecimal equivalent of decimal 24 is 0x18.
8 Which layer of the hierarchical design model implements access lists, distribution lists, route summarization, VLAN routing, security policy, and address aggregation?
a. Session layer b. Distribution layer c. Transport layer d. Core layer
Answer: b
The hierarchical design model consists of core, distribution, and access layers. The distribution layer implements access lists, distribution lists, route summarization, VLAN routing, security policy, and address aggregation.
9 Which routing protocol periodically sends its routing table to its neighbors?
a. A hierarchical routing protocol b. A hybrid routing protocol c. A link-state routing protocol d. A distance vector routing protocol. Answer: d
Distance vector routing protocols periodically send a copy of the full routing table to neighboring routers.
10 The switch functions of blocking and forwarding, which are based on a MAC address, operates in which layer of the OSI model?
a. Layer 3
b. Network layer c. Data-link layer d. Layer 1 Answer: c
Switches that implement these functions are essentially bridges that operate in the data-link layer (Layer 2).
11 Which is the best measurement of reliability and load of an interface?
a. Rely 255/255, load 1/255
b. Rely 255/255, load 255/255
d. Rely 1/255, load 255/255 Answer: a
The preferred reading for reliability is 100 percent or 255/255. The preferred reading for load is the nearest 0 percent or 1/255.
12 Which OSI layer deals with frames?
a. Physical layer b. Layer 4
c. Network layer d. Data-link layer
Answer: d
The data-link layer of the OSI model deals with frames, the physical layer deals with bits, the network layer deals with packets, and the transport layer (Layer 4) deals with segments.
13 Which type of routing protocol do you use between autonomous systems?
a. Interior Gateway Protocol b. Exterior gateway protocol c. Interior Gateway Routing Protocol d. Nonrouting exterior gateway protocol Answer: b
You use Interior Gateway Protocols (IGPs) within an autonomous system. Some IGPs are as follows: RIP, OSPF, IS-IS, and EIGRP. You use exterior gateway protocols (EGPs) between autonomous systems. BGPv4 is the commonly used EGP.
14 Which layer of the OSI model is concerned with data representation, data compression schemes, encryption, and voice coding?
a. Session layer b. Presentation layer c. Data-link layer d. Physical layer
Answer: b
The presentation layer implements data representation with ASCII and EBCDIC. MPEG is a coding and compression example at the presentation layer. In VoIP, you use codecs in the presentation layer.
15 Which metric is concerned with the time a packet takes to travel from one end to another in the internetwork?
a. Cost b. Reliability c. Delay d. Load Answer: c
The delay metric measures the time it takes for a packet to travel.
16 Which summary route aggregates the following networks: 192.168.33.0/24, 192.168.32.0/25, 192.168.32.128/25, 192.168.34.0/23?
Network 192.168.32.0, with a mask of 255.255.252.0, summarizes from 192.168.32.0 to 192.168.35.255.
17 Which device controls collision domains but does not control broadcast domains?
a. Bridges b. Hubs with Ethernet ports c. Routers d. Forwarding gateways Answer: a
Bridges define the collision domain. Routers define the broadcast domain.
18 Which routing protocol requires a hierarchical topology?
a. IGRP
c. EIGRP
d. OSPF Answer: d
OSPF requires a two-layer topology with all areas connecting to the backbone.
19 Which layer of the OSI model does TCP operate in?
a. Layer 3
b. Layer 4
c. Layer 5
d. Layer 6
Answer: b
TCP operates in the transport layer (Layer 4).
20 Convert 11011011 to decimal.
21 Which OSI layer operates with packets?
a. Physical layer b. Core layer c. Network layer d. Distribution layer
Answer: c
The physical layer deals with bits. The data-link layer deals with frames. The network layer deals with packets. The transport layer deals with segments.
22 For what metric is the value for a 10 Mbps Ethernet interface calculated as 108/107 = 10?
a. Cost b. Hop count c. Bandwidth d. Load
Answer: a
The OSPF cost metric is calculated as
23 In which type of routing protocol does each router advertise its status to all routers in the network, and each router calculates the best routes in the network?
a. Hop count b. Link-state c. Distance vector d. Hybrid state
Answer: b
With link-state routing protocols the status of each router in the network is propagated to all other routers in the network, and each router calculates the best routes in the network.
24 Which command can be used to configure the default route out interface serial 0?
a. ip default-gateway serial0
c. ip default-network serial 0
The correct format is ip route 0.0.0.0 0.0.0.0 serial 0.
25 What is 0xFC in decimal?
Answer: d
0xFC is 11111100 in binary, which is 128+64+32+16+8+4 = 252.
26 A routing protocol that sends out routes with an unreachable metric is using what?
a. Metric holddowns b. Poison reverse c. Route updates d. Simple split horizon
Answer: b
Split horizon with poison reverse sends a route with an infinite metric out the interface from which it learned the route.
27 Which hierarchical design model layer has high-speed backbone ATM switches with redundant connections?
a. Data-link layer b. Core layer c. Network layer d. Transport layer Answer: b
The core layer of the hierarchical design model uses high-speed connections.
28 Convert the mask 255.255.255.224 into binary.
a. 11111111 11111111 11111111 11000000
b. 11111111 11111111 11111111 11110000
c. 11111111 11111111 11111111 11100000
d. 00000000 00000000 00000000 00111111 Answer: c
11111111 = 255 and 11100000 = 224.
29 What does OSI stand for?
a. Operation System Interconnection b. Open System Interconnection c. Open Systems Interconnect d. Operation Systems Interconnect Answer: b
30 Which of the following routing protocols is classful?
a. IGRP
b. RIPv2
c. EIGRP
d. OSPF Answer: a
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