Test your basic knowledge |

Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is 10GBASE-LR/LW?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
On
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

2. What is LOU?
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Logical Operation Unit
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
70 km for 9 micron SMF; 100 km for 8 micron SMF

3. What is 1000BASE-SX?
Tunnel
300 seconds
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#errdisable detect cause dtp-flap

4. How are the TCAM Mask/Value pairs evaluated?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Switch#show errdisable recovery
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
In parallel revealing the best (longest) match in a single table lookup

5. How is the TCAM organised?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#errdisable detect cause dhcp-rate-limit
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets

6. What is the maximum cabling distance for 1000BASE-LX/LH?
S = Short; L = Long; E = Extra-long
Process the first packet in a traffic flow to determine the destination
R = LAN PHY; W = WAN PHY
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

7. What is the maximum cabling distance for 1000BASE-SX?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show ip cef {interface} [detail]
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch#show ip cef

8. What is 10GBASE-CX4?
SC or MT-RJ
Switch(config-if)#duplex {auto | full | half}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

9. Selects an interface-range macro and enters interface configuration mode
Static access or trunk
Switch(config)#interface range macro {name}
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#errdisable detect cause link-flap

10. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
Switch(config)#errdisable detect cause pagp-flap
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

11. What is the maximum cabling distance for 1000BASE-ZX?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
70 km for 9 micron SMF; 100 km for 8 micron SMF
Process the first packet in a traffic flow to determine the destination
Switch(config)#errdisable detect cause dhcp-rate-limit

12. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config)#errdisable detect cause gbic-invalid
Process the first packet in a traffic flow to determine the destination
Switch(config)#errdisable detect cause dtp-flap
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end

13. Enables error-disable when trunking encapsulation is flapping from one type to another
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Off
R = LAN PHY; W = WAN PHY
Switch(config)#errdisable detect cause dtp-flap

14. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause vmps
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Packets that have been truncated before they were fully received
400 metres half duplex and 2000 metres full duplex

15. What is the standard for 10 Gigabit Ethernet (10GbE)?
S = Short; L = Long; E = Extra-long
IEEE 802.3ae
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Value - Mask - and Result (VMR)

16. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause storm-control
1000BASE-T full duplex followed by 1000BASE-T half duplex
R = LAN PHY; W = WAN PHY

17. What is the administrative mode of a switch port that is a member of one VLAN?
Switch#show interfaces {interface} switchport
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Static access or dynamic
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

18. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#errdisable detect cause ilpower
15 metres
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
1000BASE-T full duplex followed by 1000BASE-T half duplex

19. Displays error-disabled detection status
Content-Addressable Memory
Switch#show errdisable detect
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
The table of learned MAC addresses - ports - and VLAN information

20. What CEF optimisation replicates the entire FIB table among switch line cards?
Static access - trunk - tunnel or dynamic
Routing table and ARP table
1000BASE-T full duplex followed by 1000BASE-T half duplex
Distributed CEF (dCEF)

21. What is CEF?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
In TCAM Value entries
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Cisco Express Forwarding

22. Enables error-disable for conditions that trigger port security configured on a port
300 seconds
Switch#show interfaces status err-disabled
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch(config)#errdisable detect cause psecure-violation

23. Configures a switch port with a static access VLAN assignment
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch#show ip cef
Switch(config-if)#switchport access vlan {vlan}

24. Enables error-disable for the presence of invalid GBIC or SFP modules
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
A name assigned to a ranges of interfaces
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#errdisable detect cause gbic-invalid

25. Enables error-disable when an interface has been looped back
Value - Mask - and Result (VMR)
In parallel revealing the best (longest) match in a single table lookup
A name assigned to a ranges of interfaces
Switch(config)#errdisable detect cause loopback

26. What is the standard for 1000BASE-T?
The Null adjacency
Packets that have been truncated before they were fully received
Switch#show cef not-cef-switched
IEEE 802.3ab

27. What is the TCAM Value and Mask for an IGMP access list?
The Layer 3 forwarding engine
S = Short; L = Long; E = Extra-long
The adjacency table
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

28. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Value - Mask - and Result (VMR)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

29. Displays interface configuration information
XENPAK - X2 - or SFP+
Switch(config-if)#shutdown
LC - MT-RJ or RJ-45
Switch#show running-config interface {interface}

30. What is an interface-range macro?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
The switch port falls back to default setting of half duplex
A name assigned to a ranges of interfaces
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

31. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
R = LAN PHY; W = WAN PHY
Feature Manager (FM) and Switching Database Manager (SDM)
XENPAK - X2 - or SFP+
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

32. When do collisions occur?
Carrier Sense Multiple Access Collision Detection
On
When one station transmits at the same time as another on a shared medium
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

33. What is unknown unicast flooding?
Multilayer Switching
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config)#errdisable detect cause bpduguard

34. What is IEEE?
Switch#show cef not-cef-switched
Institute of Electrical and Electronics Engineers
Static access or dynamic
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

35. What is 100BASE-T4?
American National Standards Institute
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
10GbE operates only at full duplex
Switch(config)#errdisable detect cause unicast-flood

36. What is CAM?
Switch(config)#interface range macro {name}
Content-Addressable Memory
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Cisco Express Forwarding

37. Removes entries from the CAM table
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
25 metres
IEEE 802.3ab
Electromagnetic Interference

38. What denotes the number of times a CEF entry has been updated since the CEF table was created?
The CEF entry version number
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Tunnel

39. What is TCAM?
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#errdisable detect cause link-flap
Creating the VLAN

40. What are the reasons for packets being punted by CEF?
Switch(config)#errdisable detect cause psecure-violation
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
R = LAN PHY; W = WAN PHY

41. What is 1000BASE-T?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
American National Standards Institute
Wide-Wavelength Division Multiplexing

42. Displays the contents of the CAM table
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#interface vlan {vlan-id}
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

43. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Switch#show running-config interface {interface}
LOU registers
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

44. How are ternary combinations implemented?
10GbE operates only at full duplex
With a mask value in addition to binary values to decide which keys in a table are relevant
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#errdisable detect cause security-violation

45. What is the name of physical network segment where data packets can collide with one another when being sent?
Switch(config)#errdisable detect cause psecure-violation
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
ANSI X3T11 FibreChannel
Collision domain

46. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
From 30 seconds to 86 -400 seconds (24 hours)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Source MAC address; Port of arrival; VLAN; Time stamp

47. How does topology based switching work?
Switch(config)#errdisable detect cause l2ptguard
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch#show interfaces status
S = Short; L = Long; E = Extra-long

48. What packets are immediately sent to the CEF Layer 3 engine for further processing?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

49. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show running-config interface {interface}
Interconnecting switches in a campus network
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

50. What is 100BASE-FX?
Static access or trunk
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Only temporarily for debugging purposes
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state