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. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
CEF punt
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause dhcp-rate-limit
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)

2. What are GigaStack GBICs used for?
Multilayer Switching
Forwarding Information Base
Trunk or dynamic
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

3. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
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
In TCAM Value entries
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

4. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
LOU registers

5. Enables error-disable for when the port link state is flapping between the up and down states
A switch port that has been shut down automatically due to a serious error condition
SVI or native routed interface
Switch(config)#errdisable detect cause link-flap
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

6. What is a ternary combination?

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

7. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config-if)#switchport access vlan {vlan}

8. What are the Gigabit Ethernet autonegotiation selection priorities?
The Layer 3 engine
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
1000BASE-T full duplex followed by 1000BASE-T half duplex

9. What is the default duplex mode of a Gigabit Ethernet interface?
Feature Manager (FM) and Switching Database Manager (SDM)
The Discard adjacency
Full duplex
By Mask/Value - where each unique mask has eight value patterns associated with it

10. What is the maximum cabling distance for 10GBASE-SR/SW?
Content-Addressable Memory
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Half duplex
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

11. What is 10GBASE-ER/EW?
300 seconds
Interconnecting switches in a campus network
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

12. Sets the administrative mode of a switch port to access
10 km
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
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
Switch(config-if)#switchport mode access

13. What is CAM?
By Mask/Value - where each unique mask has eight value patterns associated with it
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Content-Addressable Memory
Manually by administratively disabling and re-enabling the port

14. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Packets that have been truncated before they were fully received
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
1 -2 on one end with 3 -6 on the other end
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

15. What is 10GBASE-SR/SW?
Static access
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
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

16. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Switch(config)#errdisable detect cause security-violation
SVI or native routed interface
Switch(config-if)#switchport mode access

17. Enables error-disable for rate-limiting of DHCP snooping
CEF glean
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config-if)#speed {10 | 100 | 1000 | auto}
LAN PHY and WAN PHY

18. What CEF adjacency is used to switch packets destined for the null interface?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch(config)#errdisable detect cause security-violation
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
The Null adjacency

19. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
The adjacency table
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
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

20. Disables CEF operation on an interface
10 km
In TCAM Value entries
Switch(config-if)#no ip route-cache cef
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

21. Configures the maximum ageing time for entries in the MAC address table
R = LAN PHY; W = WAN PHY
Switch(config)#mac address-table aging-time {seconds}
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#errdisable detect cause security-violation

22. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
S = Short; L = Long; E = Extra-long
10 km
Switch(config-if)#no ip route-cache cef
By Mask/Value - where each unique mask has eight value patterns associated with it

23. What are the duplex modes of a GigaStack GBIC?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
In TCAM Value entries
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

24. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause udld
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Value - Mask - and Result (VMR)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

25. What is the maximum cabling distance for 1000BASE-ZX?
Switch(config)#errdisable detect cause link-flap
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Static access
70 km for 9 micron SMF; 100 km for 8 micron SMF

26. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#errdisable detect cause vmps
Source MAC address; Port of arrival; VLAN; Time stamp
Down - static access - trunk or tunnel

27. What information is stored in TCAM?
R = LAN PHY; W = WAN PHY
Switch#show interfaces status
The switch port falls back to default setting of half duplex
Security and QoS ACLs

28. What is CSMA/CD?
Carrier Sense Multiple Access Collision Detection
Institute of Electrical and Electronics Engineers
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Packets that have been truncated before they were fully received

29. What combinations are TCAM entries composed of?
Switch(config)#errdisable detect cause rootguard
Value - Mask - and Result (VMR)
Switch#show interfaces {interface} switchport
Trunk

30. What CEF optimisation replicates the entire FIB table among switch line cards?
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#interface vlan {vlan-id}
In parallel revealing the best (longest) match in a single table lookup
Distributed CEF (dCEF)

31. What is the TCAM Value and Mask for an ICMP access list?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config-if)#shutdown
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

32. Removes entries from the CAM table
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show errdisable detect
Numeric values that represent what action to take after the TCAM lookup occurs
The Drop adjacency

33. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Off
Native routed interface
IEEE 802.3
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

34. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Tunnel
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause {all | {cause-name}}

35. What are the administrative modes of Layer 2 switched interfaces?
Half duplex
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause storm-control
A name assigned to a ranges of interfaces

36. What are the common cabling specifications for Fast Ethernet?
On
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#default interface {interface}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

37. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Tunnel
Switch(config)#errdisable detect cause psecure-violation
ANSI X3T11 FibreChannel

38. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
Switched virtual interface (SVI)
SVI or native routed interface
Trunk

39. Enables error-disable for errors with offering inline power
Switch(config)#errdisable detect cause ilpower
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause channel-misconfig
Switch#show errdisable recovery

40. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Trunk
Tunnel
Switch(config)#errdisable detect cause dtp-flap
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

41. What is 100BASE-T2?
Switch(config)#errdisable detect cause loopback
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#switchport mode access
Switch(config-if)#no switchport

42. What is the TCAM Value and Mask for an IGMP access list?
Security and QoS ACLs
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config-if)#duplex {auto | full | half}
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

43. What is 1000BASE-ZX?
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause security-violation
The CEF entry version number
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

44. Configures a switch port with a static access VLAN assignment
Switch(config)#errdisable detect cause pagp-flap
Switch(config-if)#switchport access vlan {vlan}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

45. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause storm-control
Creating the VLAN
Tunnel

46. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Logical Operation Unit
They are dropped (ARP throttling)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

47. Displays CEF Drop statistics with number of packets and reason for each line card
Switch#show cef drop
Forwarding Information Base
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config-if)#description {string}

48. How are MAC addresses shown in the detailed output from the CEF adjacency table?
25 metres
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
SVI
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

49. What is the DTP negotiation mode of a switch port configured as trunk?
Static access
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config-if)#speed {10 | 100 | 1000 | auto}
On

50. What is the standard for Gigabit Ethernet (1000 Mbps)?
IEEE 802.3z
Only temporarily for debugging purposes
American National Standards Institute
The table of learned MAC addresses - ports - and VLAN information